No one was hurt in the incident, they said.
A group of armed ultras stormed into the Barbaspur iron ore mining site under the limits of Korar police station and after threatening the labourers, they torched 18 vehicles and machines engaged in mining work, Kanker Superintendent of Police M L Kotwani told PTI.
After torching the vehicles, the Maoists fled into the forest, he said.
On receiving information about the incident, a police team rushed to the spot and found 15 trucks, one pick up vehicle, one excavator and one loader burnt, he said.
The ultras are reportedly opposing iron ore mining in the area.