Police say they are looking for three suspects after the Hatzola ambulances were set on fire.
The PM also tells senior MPs the conflict was "not our war" and there must be a "lawful basis" for any UK involvement.
The 34-year-old was released pending further inquiries, while a 31-year-old Romanian woman was released without charge.
Gavin Burrows says he did not give a 'fake' statement admitting to working for the publisher.
Evidence in the trial of Stephen McCullagh outlined a cold, calculating plan to kill Natalie McNally and get away with it.