(1) A terrorist group that engages in, promotes, encourages or advocates the commission, in or outside the State, of a terrorist activity is an unlawful organisation within the meaning and for the purposes of the Offences against the State Acts 1939 to 1998 and section 3 of the Criminal Law Act 1976.

(2) For the purposes of this Act, the Offences against the State Acts 1939 to 1998 and section 3 of the Criminal Law Act 1976 apply with any necessary modifications and have effect in relation to a terrorist group referred to in subsection (1) as if that group were an organisation referred to in section 18 of the Act of 1939.

(3) Subsections (1) and (2) are not to be taken to be limited by any other provision of this Act that refers to provisions of the Offences against the State Acts 1939 to 1998 or that makes provisions of those Acts applicable in relation to offences under this Act.

(4) Subsections (1) and (2) apply whether the terrorist group is based in or outside the State.