There are reports of CPM and Trinamool supporters hurling bombs at each other after the meeting ended.
At the meeting, Mamata Banerjee claimed the CPI-M was importing Maoists from Nepal and providing them with arms to terrorise the people.
Earlier, on her way to Khanakul from Kolkata, Mamata Banerjee's convoy was briefly blocked by CPM workers.
Tension has been brewing at Khanakul over the last couple of months but peaked last week when CPM and Trinamool workers clashed repeatedly.
A 70-year-old woman who was a CPM supporter and who was allegedly injured in a clash in September died in a Kolkata hospital on Wednesday.
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