4.—(1) Subject to subsections (4) and (5), any person may arrest without warrant anyone who is or whom he or she, with reasonable cause, suspects to be in the act of committing an arrestable offence.

(2) Subject to subsections (4) and (5), where an arrestable offence has been committed, any person may arrest without warrant anyone who is or whom he or she, with reasonable cause, suspects to be guilty of the offence.

(3) Where a member of the Garda Síochána, with reasonable cause, suspects that an arrestable offence has been committed, he or she may arrest without warrant anyone whom the member, with reasonable cause, suspects to be guilty of the offence.

(4) An arrest other than by a member of the Garda Síochána may only be effected by a person under subsection (1) or (2) where he or she, with reasonable cause, suspects that the person to be arrested by him or her would otherwise attempt to avoid, or is avoiding, arrest by a member of the Garda Síochána.

(5) A person who is arrested pursuant to this section by a person other than a member of the Garda Síochána shall be transferred into the custody of the Garda Síochána as soon as practicable.

(6) This section shall not affect the operation of any enactment restricting the institution of proceedings for an offence or prejudice any power of arrest conferred by law apart from this section.