The case was filed at the Banna Devi police station under relevant sections of IPC, four days after the BSP corporator filed a complaint with the police.
The FIR against BJP members comes in the wake of mounting pressure by opposition parties alleging that the police was taking one-sided view of the entire episode.
SSP Rajesh Pandey told PTI that those responsible for the unsavoury incident would be identified on the basis of video recording of the oath taking ceremony.
The police officer also refuted allegations that Hussain was earlier booked because he took oath in Urdu.
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"It is his constitutional right and there is no question of having booked him on that point," Pandey said.
Meanwhile, Congress leader Yogesh Dikshit has demanded Z+ security for the newly elected mayor Mohammed Furqan in the wake of "serious threat to his life".
Furqan of BSP had won the mayoral post in the just concluded civic body elections, upsetting the BJP's applecart.
Husain, who was allegedly beaten up, had told media later that there was a conspiracy to kill him.
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