Maoists today claimed the responsibility for killing four persons in West Bengal’s West Midnapore district.

“Anil Chalak, Dayal Chalak, Amol Patra and Sisir Mahato were eliminated by us because they were working as police informers. We had warned them, but they didn’t pay heed and were eliminated,” top Maoist leader Kishenji told PTI over phone from an undisclosed location.

CPI(M) worker Sisir was shot dead yesterday at Dharampur village in the district. On Thursday, around 500 people barged into Bandhgara and Chandra villages in Lalgarh area and shot dead Dayal, Anil and Amol.

On Maoists vandalising a sponge iron factory and setting fire to 25 trucks, 12 motorbikes and three oil tankers on Friday, Kishenji said sponge iron units were a source of pollution.

There are at least 12 sponge iron factories on the West Bengal-Jharkhand border which are polluting the atmosphere, he said.

“There are several factories along the national highway from Lodhasuli to Chandil and particularly in Jharkhand’s Singbhum district. When our prime minister is going to Copenhegen to save the world from climate change he should be aware that the people of his own country are suffering from pollution,” he said.