KOHAT, Aug 7: Three children were killed in Darra Adam Khel, Frontier Region of Kohat, 12 kilometers north of here, when a toy-bomb they were playing with exploded in a house on Monday. The in-charge of Khasadar force, Iran Gul, said that the incident occurred in Zarghun Khel area, and identified the victims as Usman (6), Shahab (8) and Azeem (10).