A magistrate
A chief magistrate and a magistrate grade I are competent to issue a warrant of arrest to prevent a breach of the peace or disturbance of the public tranquillity when the wrongful act cannot be prevented otherwise than by detaining the person in custody.
A police officer
A police officer who has reasonable cause to believe that the arrest and detention of a person is necessary to prevent an offence may arrest that person.
Legislation:
- Section 12 of the Magistrates courts act
- Section 24 sub.1 of the Police act