Maoists on Monday opened fire on a CRPF camp, triggering an encounter with security forces at Rania in Khunti district, the police said here.
According to Rania police station in-charge Raj Kapoor, the rebels opened fire soon after the flag hoisting ceremony at the CRPF camp.
The security personnel also retaliated, he added.
Details were still awaited, he said when asked whether there was casualty on any side.