In Bihar seven children were killed and a few injured in a cylinder bomb explosion in Aurangabad district of the state on Sunday morning. The incident occurred in Pachokhar village under Deo police station of the district.AIR Patna correspondent reports that the cylinder bomb was detected on Saturday during polling but could not diffuse. It was kept under sandbag near road for disposal on Sunday.Director General of police Neelmani told AIR that Chowkidar was deputed and villagers were alerted about it.The bomb exploded instantly when some boys fiddled with it. Injured have been admitted to hospital. Police officials have reached on the spot.