Around 30 Maoists, flaunting fire arms, intercepted the mineral-laden dumpers and ordered the drivers to get down before they set the vehicles aflame near Kolbonga village in the Saranda forest range under Manohapur police station last night, Superintendent of Police Michael Raj S said.
The mineral were being transported from Chiria mine owned by SAIL.
On being informed of the incident, security forces rushed to the spot and launched a combing operation to trace the ultras.