PSNI officers were today investigating a suspected arson attack on a former technical college in Co Antrim.
The fire was reported at the old Technical College in Castle Gardens, Lisburn around 3am.
Northern Ireland Fire and Rescue Service said the roof of the disused building collapsed.
Randal McComb, District Commander at Lisburn, said the fire started on the first floor of the three-storey building.
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Mr McComb said: "The cause of the fire is still under investigation but early indications would suggest it was started deliberately."