4(1)Where it appears to the Secretary of State that there are grounds for suspecting that a person has been concerned—
(a)in the commission or attempted commission of any act of terrorism; or
(b)in directing, organising or training persons for the purpose of terrorism,
the Secretary of State may make an interim custody order for the temporary detention of that person.
(2)An interim custody order shall be signed by the Secretary of State or a Minister of State or Under Secretary of State.