Mohaniya, who is also vice chairman of Delhi Jal Board, was picked up by a police team while addressing a press conference at his office in Khanpur in South Delhi.
The MLA was booked on June 23 for allegedly misbehaving with a group of women who approached him with a complaint regarding water crisis in their locality.
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"An FIR has been registered under Sections 323, 506 and 509 of IPC against Mohaniya at Neb Sarai Police Station following a complaint by the group of women," Nupur Prasad, Additional DCP (South), said.
The complainants, who are residents of Sangam Vihar, alleged that Mohaniya and his accomplices "manhandled" and "threatened" them when they sought his help in the water crisis faced by them.
Mohania dismissed the charges against him as "baseless".
"I am ready to cooperate with the police investigation but the allegations against me are baseless," he said.
Another case has been registered against Mohaniya at Govindpuri Police Station for allegedly slapping a 60-year-old man in Tughlaquabad area yesterday.