11.   Five-story and taller buildings will undergo compulsory structural checks beginning September, a government minister said Tuesday.

12.   Investigators were trying to determine if the building had undergone any unauthorized restructuring which could have caused the collapse.

13.   No explosion was heard, and the building had been undergoing renovations.

14.   The building had been undergoing renovation, and there was no immediate suspicion that the fire was deliberately set, the Northern Ireland Office said.

15.   The cause of the collapse was under investigation, but the building was undergoing roof repairs at the time, police said.

16.   Damage was confined to the house where the device exploded, the spokesman said, adding that the building was undergoing renovation.

17.   Neighbours said that the building had been undergoing the addition of a fourth storey.