The incident took place between Bandarchua and Pundag villages under Samri police station limits, where the road was being constructed under the Prime Minister Gram Sadak Yojana (PMGSY), a local police officer told PTI.
"A group of around two dozen ultras reached the construction site, located around 500 km away from the state capital, and threatened workers to stop the work. Before fleeing from the spot, the ultras burnt one JCB machine, one road roller and three hyva trucks," he said.
"One sub-engineer of PMGSY and two employees of a private construction company who were working at the site were reported to be missing from the spot. As of now it was not clear whether they were kidnapped by naxals or they themselves escaped into the forests after the ultras stormed in," the official said.
Police were also trying to find out the whereabouts of the three missing people, he added.