A fire at a charity's headquarters in Belfast could be linked to a possible break in, police have said.
Security camera footage of the blaze
The Chest, Heart and Stroke Association offices were badly damaged in the blaze on Dublin Road early on Monday.
Some of the charity's collecting tins had been found earlier in a car that had crashed at Curzon Street, off the lower Ormeau Road, in south Belfast.
The fire started in ground floor offices at the back of the building before spreading rapidly.
It was spotted by officers in a passing police car several hours later.
No-one was injured in the fire.
Chief executive Andrew Dougal said the fire could have caused greater damage.
"I have seen the ground floor, where the seat of the fire seems to have been," he said.
"There are two offices which are completely destroyed.
"The ceiling has fallen in, and there could be structural problems.
"If it wasn't for the fire doors, the whole building could have been lost."
Station Officer Harry Dawson said the fire was hard to bring under control, as the building was a "maze of offices".
He said fire officers were subjected to extreme temperatures.
The charity has begun to look for temporary offices for its 25 full time and part time staff.