Criminal Procedure
Section 8. Method of arrest by officer without warrant. - When making an arrest without a warrant, the officer shall inform the person to be arrested of his authority and the cause of the arrest, unless the latter is either engaged in the commission of an offense, is pursued immediately after its commission, has escaped, flees or forcibly resists before the officer has opportunity so to inform him, or when the giving of such information will imperil the arrest. (8a)