Security has been stepped up for the penultimate fourth phase Lok Sabha poll in West Bengal tomorrow as four of the six seats going to the poll fall in Jangalmahal where the Maoists ruled till recently.

The Left Front is under pressure to retain the six seats, Bankura, Jhargram, Purulia, Medinipur, Bishnupur and Asansol, it had won in the 2009 Lok Sabha election, though with a reduced margin.

Of the six, the CPI-M had won four and Forward Bloc and CPI shared one seat each in the 2009 Lok Sabha elections. Former actresses Moonmoon Sen and Sandhya Roy and singer Babul Supriyo are expected to give a tough fight in three of the six seats.

In the 2011 Assembly election, the Trinamool Congress had made deep inroads in the assembly segments falling under these six seats covering the districts of West Midnapore, Purulia, Bankura and Bardhaman.