Bombs were used in the clash that occurred at Gopalpur Lebutala locality of Haroa, poilce said.
The injured were stated to be Trinamool Congress activists, the sources said, adding one CPI(M) worker was arrested.
Haroa witnessed clash between the two parties yesterday also during polling leaving 13 persons injured.
The area falls under Minakha Assembly segment of Basirhat Lok Sabha constituency.