An aerial survey has been carried out in parts of Jharkhand and West Bengal to find out the routes the injured Maoists might have taken to escape following their encounter with security forces in Dumka district, police said.

The aerial survey was carried out on Tuesday, two days after a zonal commander of CPI (Maoists), Tala da alias Sahdeo Rai, was killed in the encounter at Chatpura under the jurisdiction of Shikaripara police station in the Maoist-affected district, the police said.