Two of the victims were seriously injured in the clash that took place a day after polling in West Bengal.
According to, Rajaram Ghosh, one of the injured, CPI-M cadres were terrorising residents soon after polling ended on Thursday, May 8.
He claimed that CPI-M workers attacked him as he was returning from the Mohammed Bazar Police station where he had gone to lodge a complaint.
Several Congress workers then rushed to their Block President's aid and in the ensuing clash, nine other persons were hurt.
Among the injured, six are Congress party workers, while the rest are from the CPI-M.
In the polling that took place May 7, there were instances of booth capturing and minor clashes between workers of opposing parties in the sensitive Nandigram area of East Medinipur district.
Incidents of violence were also reported from other places such as Krishnanagar and Jangipur.