Security measures in Maoist infested Purulia district was beefed up on Wednesday in view of polling on April 30.
In a joint press conference in Purulia, District Magistrate Santanu Bose and Superintendent of Police Rajesh Yadav said 500 persons were arrested so far.
Eleven check posts within 380 km radius between Purulia and Bokaro and Ramgarh in Jharkhand will be sealed ten days before the polls.
Police are keeping close watch on the safety and security of villagers in 430 earmarked localities.
A helicopter has been kept ready for use in naxal infested areas of Purulia, Bankura and West Midnapore. High officials are keeping close watch on the movement of maoists.
Earlier, Debasis Sen state’s Chief Electoral Officer visited the Maoist infested areas of Jangalmahal and alerted all concerned about security measures.