At least 20 people were injured Monday in a clash between activists of the CPI-M and CPI-M in West Bengal's North 24-Parganas district, police said.
The incident took place in Basirhat Lok Sabha constituency's Haroa village, some 40 km from Kolkata.
Some of the injured, said to be CPI-M activists, accused the Trinamool of orchestrating the attack and claimed four of them received bullet injuries.
The ruling party in the state, however, rubbished the allegations and claimed 11 of its activists sustained injuries.
"We have received information about a clash in Haroa, in which 20 people are said to be injured," said a police officer but denied anyone received bullet injuries.
One of the injured said around 200 of them - all CPI-M supporters - were on their way to cast their votes in Brahmanchak village when they were attacked.
"We were going to the polling booth when around 30-40 men, all Trinamool activists, attacked us with weapons, including guns," said Ruma Mandal, one of the injured who was admitted to a hospital.
Another injured, Tutul Mandal, said at least four of them received bullet injuries and most of the injured lay bleeding for hours before police eventually carried them to a hospital.
The Trinamool blamed the CPI-M for the incident.
"In Haroa, CPI-M's former panchayat head Dinabandhu Mandal was behind this clash, in which 11 of our workers were injured," Trinamool spokesperson Derek O'Brien said.