The six seats are Bankura, Jhargram (ST), Purulia, Medinipur, Bishnupur (SC) and Asansol.
Adequate central forces were deployed in all the polling stations of the region and Standard Operating Procedure of the Ministry of Home Affairs was being followed strictly for the entire fourth phase giving special priority to the LWE (Left Wing Extremist) areas.
Area domination, route march and flag marches have been undertaken in the entire region.
A security net has been thrown around the areas going to polls with special deployment of Bomb Detection and Disposal Squad and anti-landmine vehicles.
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The Left Front is under pressure to retain the six seats 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.
One of the most watched constituencies in this phase is Bankura where Basudeb Acharia is pitted against former actress Moonmoon Sen of Trinamool Congress.
The BJP is likely to be a crucial factor in at least two seats - Asansol and Bankura, and has generated a lot of interest among the electorate.