"As per preliminary reports, four persons were killed as CISF personnel opened fire after coming under attack in a village. A scuffle took place, and locals gheraoed them and attempted to snatch their rifles, following which the central forces opened fire. Further details are awaited," a senior district police officer said.
The TMC claimed that the four deceased persons were its supporters.
When asked whether any action has been taken against the CISF personnel, a senior police officer said, "It is for the EC to decide. As per our reports, they opened fire in self-defence."
"Polling has been stopped at polling station number 126 of Sitalkuchi Assembly Constituency, Cooch Behar, further investigation is underway," DIG, Jalpaiguri Range told ANI
Clashes broke out between TMC and BJP activists in Mathabhanga area of Sitalkuchi while voting was underway, a source said.
"Some of them gheraoed CISF personnel outside a polling booth and attempted to snatch their rifles, after which the incident took place," he said.
Election officials said a report on the incident has been sought from the district officials.
The four bodies were taken to a nearby hospital.
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Earlier in the morning, a first-time voter was shot dead by unidentified persons outside a polling booth in the same Sitalkuchi assembly constituency area.
BJP's Cooch Behar MP Nisith Pramanik, who is also contesting the assembly elections from Dinhata constituency, alleged that TMC supporters attacked the booth.
"TMC goons attacked the booth with an intention to loot it. Maybe the central forces opened fire in self- defence," he said.