SLAMABAD: A blast ripped through the top floor of a hotel building in the Pakistani capital Islamabad, injuring at least six people late Thursday, police officials said.

City police chief Bani Amin said the cause of the blast “appears to be a gas cylinder” as gas was still leaking at the Citi Hotel in the Blue Area, a normally bustling district of shops and restaurants.

Another police official at the scene told AFP at least six people were injured.