Section 171 of BNSS, 2023 — Prevention of Injury to Public Property

Introduction

Section 171 of the Bharatiya Nagarik Suraksha Sanhita, 2023 empowers a police officer to intervene on his own authority when an attempt is being made, in the officer’s view, to cause injury to public property or to remove or damage certain public landmarks and navigational marks.

The provision is preventive in nature. It does not itself create an offence or prescribe a punishment. Instead, it gives the police immediate authority to protect public property from an injury that is being attempted in their presence.

Section 171 BNSS substantially continues the earlier Section 152 of the Code of Criminal Procedure, 1973 (CrPC). The core power remains unchanged.

Meaning of Section 171

Section 171 allows a police officer to intervene when the officer personally sees an attempt to:

• cause injury to public property, whether movable or immovable; or
• remove or cause injury to a public landmark, buoy or other mark used for navigation.

The expression “of his own authority” is important. It means that the police officer does not have to wait for a prior order from a Magistrate before taking preventive action within the scope of this section.

The power is therefore designed for immediate preventive intervention.

Statutory Basis

Section 171 provides:

A police officer may of his own authority interpose to prevent any injury attempted to be committed in his view to any public property, movable or immovable, or the removal or injury of any public landmark, buoy or other mark used for navigation.

The provision forms part of Chapter XII — Preventive Action of the Police.

The surrounding provisions are:

Section	Subject
Section 168	Police to prevent cognizable offences
Section 169	Information of design to commit cognizable offences
Section 170	Arrest to prevent commission of cognizable offences
Section 171	Prevention of injury to public property
Section 172	Persons bound to conform to lawful directions of police

These provisions collectively deal with preventive police action.

Object and Purpose

The purpose of Section 171 is to enable immediate police intervention to protect public property and specified public landmarks from damage or removal.

Ordinarily, criminal law operates after an unlawful act has occurred and provides for investigation and prosecution. Section 171 serves a different function: it permits the police to prevent the threatened injury before it is completed.

The provision is therefore particularly relevant where waiting for a formal order could allow public property or a navigational mark to be damaged or removed.

Nature of Section 171

Section 171 is a preventive procedural provision.

It does not:

• define a criminal offence;
• prescribe a punishment;
• determine guilt;
• provide a procedure for trial; or
• independently establish the liability of the person causing the damage.

Instead, it confers a limited preventive power on the police.

Any criminal liability arising from the conduct itself would depend upon the applicable substantive law, including the Bharatiya Nyaya Sanhita, 2023 or another applicable statute.

Essential Elements

1. The person exercising the power must be a police officer

The power under Section 171 is specifically granted to a police officer.

It is not a general power available to every public servant or private person.

2. The officer may act on his own authority

The police officer may “of his own authority” intervene.

This means that the officer does not require a prior Magistrate’s order merely to exercise the preventive power under this section.

3. There must be an attempted injury

The provision concerns an attempted injury to public property or the removal or injury of specified public landmarks or navigational marks.

The section is therefore preventive. It allows intervention before the threatened damage is completed.

4. The attempt must be in the officer’s view

This is a particularly important limitation.

The injury must be attempted “in his view.”

The provision therefore contemplates direct observation by the police officer rather than merely acting on an unverified allegation that damage may occur.

5. The property must fall within the statutory category

The provision applies to:

• public property that is movable;
• public property that is immovable;
• public landmarks;
• buoys; and
• other marks used for navigation.

What is Public Property?

Section 171 does not itself provide an exhaustive definition of “public property.”

The expression should therefore be understood in its ordinary legal context as property belonging to, controlled by, or intended for public use or public purposes, depending upon the circumstances and applicable law.

Examples may include public buildings, government installations, public infrastructure and other property maintained for public purposes.

The provision expressly covers both movable and immovable public property.

Public Landmarks and Navigational Marks

Section 171 specifically extends beyond ordinary public property.

It also protects:

Public landmarks

A public landmark may include a structure or mark used to identify or indicate a particular place or location.

Buoys

A buoy is a floating marker used in waterways for navigational purposes.

Other marks used for navigation

The provision also protects other navigational marks whose removal or injury could interfere with safe navigation.

The inclusion of these objects reflects the preventive purpose of the provision: damage to a navigational aid can create risks extending beyond damage to the physical object itself.

Powers of the Police

The central power under Section 171 is the power to interpose.

“Interpose” means to step in or intervene to prevent the threatened injury.

The officer may therefore take immediate preventive action reasonably necessary to stop the attempted injury, subject to the limits imposed by law.

Section 171 should not, however, be interpreted as an unlimited power to use force or take any action whatsoever. Any police action must remain within the authority conferred by law and comply with constitutional and statutory safeguards.

Section 171 Does Not Itself Authorise Arrest

A common confusion is to assume that Section 171 itself gives the police an independent power of arrest.

It does not.

Section 171 specifically concerns intervention to prevent injury to public property or specified public landmarks and navigational marks.

Arrest powers are governed by the applicable provisions of BNSS, including Section 170 where the statutory conditions for preventive arrest to prevent a cognizable offence are satisfied, and other applicable provisions concerning arrest.

Therefore:

Section 171 = preventive intervention

Section 170 = preventive arrest in specified circumstances

These powers should not be treated as identical.

Section 171 and Section 172

Section 172 immediately follows Section 171 and is particularly relevant to its practical operation.

Section 172 requires persons to conform to the lawful directions of a police officer given in fulfilment of duties under Chapter XII.

It also provides a mechanism for dealing with a person who resists, refuses, ignores or disregards such lawful directions.

Thus, Section 171 gives the police preventive authority to intervene against injury to public property, while Section 172 deals more broadly with compliance with lawful police directions issued in the discharge of duties under the chapter.

Procedure under Section 171

Section 171 does not prescribe a detailed multi-stage procedure.

Its operation can be understood as follows:

Step 1: A police officer observes an attempt to cause injury to public property or to remove or injure a specified landmark or navigational mark.

Step 2: The officer determines that the conduct falls within the scope of Section 171.

Step 3: The officer may, on his own authority, intervene.

Step 4: The immediate objective is to prevent the threatened injury or removal.

Step 5: If the conduct also constitutes an offence under substantive criminal law, the applicable provisions governing investigation, arrest and prosecution may subsequently become relevant.

Examples

Example 1: Damage to a government building

A person is seen attempting to break the doors and windows of a government office.

If the property falls within the scope of public property, a police officer who witnesses the attempt may intervene under Section 171 to prevent the damage.

Example 2: Damage to public infrastructure

A person is attempting to destroy a publicly maintained installation.

The police officer witnessing the attempt may intervene to prevent the injury to the public property.

Example 3: Removal of a navigational buoy

A person is attempting to remove a buoy used to guide vessels through a waterway.

The police officer may intervene to prevent its removal because Section 171 expressly protects buoys and other marks used for navigation.

Example 4: Damage already completed

Suppose the public property was damaged before the police officer arrived and the officer did not witness any ongoing attempt.

Section 171’s immediate preventive power would not operate in the same manner because the statutory language concerns injury attempted to be committed in the officer’s view.

Other provisions of criminal law may nevertheless apply to the completed damage.

Important Limitations

Section 171 contains important built-in limitations.

The officer must be acting in relation to an attempted injury

The provision is not a general authority to interfere with every activity involving public property.

The attempt must be in the officer’s view

The wording specifically requires the attempted injury to be within the officer’s view.

The property or object must fall within the statutory scope

The provision covers public property and specifically identified public landmarks, buoys and other navigational marks.

The power is preventive

The primary purpose is to prevent injury or removal, not to punish a person.

Other laws may independently apply

Where the conduct constitutes a substantive offence, the relevant provisions of BNS or another applicable law may operate independently.

BNSS and CrPC

Section 171 BNSS corresponds to Section 152 of the Code of Criminal Procedure, 1973.

Aspect	CrPC, 1973	BNSS, 2023
Provision	Section 152	Section 171
Subject	Prevention of injury to public property	Prevention of injury to public property
Police power	Police may intervene	Police may intervene
Public property	Movable and immovable	Movable and immovable
Public landmarks	Covered	Covered
Buoys/navigation marks	Covered	Covered
Prior Magistrate’s order	Not required for the statutory intervention	Not required for the statutory intervention
Major substantive change	No major change	Core provision substantially retained

The principal change is therefore renumbering rather than a substantive alteration of the operative rule.

The earlier Section 152 CrPC should be remembered as the corresponding provision when studying the pre-BNSS framework.

Relationship with Other BNSS Provisions

Section 168

Section 168 imposes a broader preventive duty on police officers to prevent the commission of cognizable offences.

Section 171 is more specifically concerned with preventing injury to public property and specified public landmarks and navigational marks.

Section 170

Section 170 concerns preventive arrest where a police officer knows of a design to commit a cognizable offence and the offence cannot otherwise be prevented.

Section 171, by contrast, concerns immediate intervention to prevent injury to public property.

Section 172

Section 172 requires persons to comply with lawful police directions given in fulfilment of duties under Chapter XII.

It therefore complements the preventive powers contained in the preceding provisions.

Constitutional Connection

Section 171 involves the exercise of police power and therefore must operate within constitutional limits.

Article 14

Police action must not be arbitrary or discriminatory.

Article 21

Any interference with a person’s liberty must follow a procedure established by law and satisfy constitutional standards of fairness and reasonableness.

Section 171 itself authorises preventive intervention, but it does not displace other constitutional safeguards applicable to police action.

Case Law

Section 171 BNSS substantially reproduces the substance of Section 152 CrPC. Consequently, there is limited scope for a large body of independent BNSS case law specifically interpreting Section 171 at present.

Judicial principles developed under the corresponding CrPC provision may therefore assist in understanding the nature and limits of the preventive police power, particularly where the statutory language remains substantially the same.

However, decisions under Section 152 CrPC should not automatically be treated as decisions on every aspect of BNSS where another provision has materially changed.

Important Distinctions

Section 171 vs Section 168 BNSS

Point	Section 168	Section 171
Focus	Prevention of cognizable offences	Prevention of injury to public property
Nature	General preventive duty/power	Specific preventive power
Trigger	Commission of cognizable offence	Attempted injury to public property or specified objects
Officer’s role	Prevent commission of cognizable offence	Intervene to prevent injury/removal
Scope	Wider in relation to cognizable offences	Specifically concerned with public property and specified marks

Section 171 vs Section 170 BNSS

Point	Section 171	Section 170
Main power	Preventive intervention	Preventive arrest
Subject	Injury to public property and specified objects	Prevention of commission of cognizable offence
Arrest authorised by provision?	No	Yes, subject to statutory conditions
Prior Magistrate order	Not required for intervention	Not required for arrest under the provision
Main purpose	Stop threatened injury	Prevent commission of cognizable offence

Common Confusions

Does Section 171 create a criminal offence?

No.

It is a procedural provision conferring preventive authority on the police. It does not itself prescribe a punishment.

Can the police intervene without obtaining a Magistrate’s order?

Yes.

The section expressly permits the police officer to act of his own authority.

Does Section 171 cover only immovable public property?

No.

It expressly covers both movable and immovable public property.

Does it protect navigational objects?

Yes.

The provision expressly mentions buoys and other marks used for navigation, in addition to public landmarks.

Does Section 171 itself authorise arrest?

No.

Arrest must be justified under a separate applicable provision of BNSS or another law.

Is Section 171 the same as Section 171 CrPC?

No.

The numbering changed substantially under BNSS. Section 171 BNSS corresponds to Section 152 CrPC, not Section 171 CrPC.

Topic at a Glance

Point	Position
Provision	Section 171, BNSS, 2023
Subject	Prevention of injury to public property
Nature	Preventive police power
Corresponding CrPC provision	Section 152
Authority	Police officer
Power	May intervene on his own authority
Trigger	Attempted injury committed in the officer’s view
Property covered	Public property, movable or immovable
Other objects covered	Public landmarks, buoys and other navigational marks
Punishment under Section 171	None
Independent arrest power	None
Major BNSS change	No substantial change in the core rule

Quick Revision

• Section 171 BNSS = Prevention of injury to public property.
• It is part of Chapter XII — Preventive Action of the Police.
• It corresponds to Section 152 CrPC.
• A police officer may act of his own authority.
• The officer may intervene when an injury is attempted in his view.
• It covers public property, whether movable or immovable.
• It also covers public landmarks.
• It expressly protects buoys and other marks used for navigation.
• The provision is preventive, not punitive.
• Section 171 itself does not prescribe punishment.
• Section 171 itself does not create an independent power of arrest.
• Section 170 deals separately with preventive arrest in specified circumstances.
• Section 172 requires compliance with lawful police directions under Chapter XII.
• The core rule is substantially the same as Section 152 CrPC.
• The provision should be understood as enabling immediate police intervention to prevent damage, rather than as a mechanism for punishing completed damage.

ALSO READ: Section 170 – Arrest to prevent commission of cognizable offences

Conclusion

Section 171 BNSS provides a focused preventive power to the police for protecting public property and specified public landmarks and navigational aids. Its significance lies in allowing immediate intervention when an attempt to cause injury is actually taking place in the police officer’s view. The provision does not itself create an offence or authorise arrest; rather, it operates as part of the wider preventive framework of Chapter XII. Since it substantially retains the earlier Section 152 CrPC rule, the principal change under BNSS is the renumbering of the provision rather than a major alteration of its legal substance.