Five security personnel, including three policemen, were killed when armed Maoists attacked them during the construction of a tunnel in Bihar's Aurangabad district.
According to television reports, the encounter started yesterday when a police contingent reached the spot for reinforcement on getting the information about the attack, following which the Maoists fired at the security personnel who retaliated.
A combing operation is on to nab the ultras.
Further details are awaited.