Fresh violence broke out in West Bengal's Nandigram area on Sunday as supporters of the ruling Communist Party of India-Marxist (CPI-M) and a Trinamool Congress-backed group clashed.
The two sides hurled bombs and the police used batons to disperse the mobs, injuring several people, official sources said.
Both the CPI-M and the Bhumi Uchched Pratirodh Committee (BUPC) had taken out separate processions when the fighting occurred.
The CPI-M supporters were celebrating the party's win in the Haldia municipal elections while BUPC wanted to surround the Nandigram police station.
Even though the proposed SEZ in the area was scrapped after violence claimed nearly 21 lives there, the CPI-M and BUPC cadres have been clashing against each other.