A group of armed Maoists stormed into a mine operated by NMDC ltd in the insurgency-hit Dantewada district and set afire dumpers and drilling machine involved in mining work, Superintendent of Police (SP) Dantewada, Kamlochan Kashyap informed on Monday. “A group of Maoists arrived at NMDC’s deposit number-5 located on Bailadila hills mining area under Bacheli police station limits on the intervening night of Sunday and Monday and torched the drilling machine and a dumper engaged in mining work,” the SP said.