In Bihar, Maoists on Monday triggered a blast near a bridge on CHAKAI-JAMUI main road in Batia jungle area under Sona police station of Jamui district . Superintendent of Police, K. K. Singh said, no one has been injured in the incident. Jawans of BSF retaliated after the explosion and the extremists fled away. Helicopter has been sent there to monitor the activities of the Maoists, he added.