Kurnool, April 10: The Sirvel police are on high alert when some unidentified persons set ablaze to an earthmover near Nandyal-Giddalur high way in dense Nallamala forest in Kurnool district in the early hours of Saturday.

According to sources, Jambanna, a bamboo contractor and a native of Paccharla village, had shifted his residence to Nandyal after receiving life threats from Maoists.