Militants of the Garo National Liberation Army (GNLA) burnt down 13 coal-laden trucks in Meghalaya's East Garo Hills district on Saturday.
About 10 heavily armed militants deflated the tyres before torching the trucks parked at a lot at Wageassi on National Highway-62, the police said.
Additional District Magistrate W.D. Sangma rushed to the spot to ascertain the damage.
District police chief J.F.K. Marak also visited the scene, East Garo Hills District Deputy Commissioner Vijay Mantri said.