Trucks and constructionmachinery engaged in road work in Chhattisgarh's Balrampur were set ablaze by Naxals on Monday morning, police said.Around a dozen armed Maoists raided the construction site near Bandarchua village under Samri police station limits, some 450 kilometres from here, between 10am and 11am and set afire three trucks, two excavators and one concrete mixer machine, an official said."The vehicles and machines were deployed for a work under the Pradhan Mantri Gram Sadak Yojana. The site is on the border of Chhattisgarh and Jharkhand. The ultras escaped into the jungles of the neighbouring state. A team under Balrampur Superintendent of Police TR Koshima has rushed to the spot," he added.The arson took place in north Chhattisgarh which incidentally the state government has earlier claimed to be an area freed from Left Wing Extremism (LWE).