The alleged assault prompted the TMC leadership to expel the councillor from the party, though the accused denied that he assaulted the acting principal.
Police said Tarakeshwar Mondal, acting principal of Burdwan Raj College, had lodged an FIR with Burdwan police station alleging that Basir Ahmed alias Badshah, the councillor of ward no 27 of Burdwan Municipality, assaulted him at a picnic organised by another Trinamool Congress councillor.
Mondal, who alleged that Badshah together with outsiders was trying to create unrest inside the college, was admitted to Burdwan Medical College and hospital.
The acting principal claimed that he was assaulted as he had protested against outside interference in the college.
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Asked why he, being the acting principal of a college, had gone to the picnic organised by a political party, he said he is a Trinamool Congress supporter and can go there.
As the issue has been resolved between the two, he wanted to withdraw the complaint, the acting principal said in the letter, according to a police officer.
Mondal could not be contacted to know why he wants to withdraw the complaint against the Trinamool leader.
Badshah, who has since been absconding, has denied assaulting the principal although he admitted that there was a face-off, the police officer said.
Meanwhile, Minister of Youth Services and Housing, Arup Biswas, who is also the TMC observer for Burdwan district, announced that Badshah has been expelled from the party.