Twenty-two Indian security forces were killed and 30 others injured in a gun battle with Maoist rebels in a central Indian state, police said Sunday, in the deadliest ambush of its kind in four years. "So far it is confirmed that 22 security personnel were killed" on Saturday after Indian forces were ambushed while returning from a search operation near a forest in Bijapur district in Chhattisgarh, state police's Additional Director General Ashok Juneja told AFP. str/grk/oho