Fire at former factory on Faulkner Road, Bangor, was arson
A fire at a disused factory in Bangor in County Down is believed to have been started deliberately, the police have said.
The fire was reported at about 23:50 BST on Saturday.
Residents living nearby were told to keep their doors and windows closed to avoid the large volumes of smoke.
Fire service group commander Randy McComb said it took crews several hours to bring the blaze under control.
"It was a very well-developed fire and it's a very large building - about 100 metres by 60 metres," he said.
"The fire was right through the roof when we arrived, it took eight appliances to deal with the fire and it took us about six hours to bring the fire fully under control."