A gas explosion Sunday in an Algerian apartment building killed 17 people and left about 30 injured, police said. The explosion, caused by a gas leak in the building's ground floor, occurred at about 8:30 a.m. (0730 GMT) in the town of Ain Defla in the Guelma region, 450 kilometers (280 miles) east of the capital. About 30 people were being treated for injuries, the national police said in a statement.