An FIR has been registered against wrestler and assistant commissioner of police Narsingh Yadav for allegedly campaigning for a Congress candidate, a police official said on Tuesday.

Yadav, posted at the local arms division of Mumbai Police, on Sunday allegedly participated in the campaign of Congress leader Sanjay Nirupam, who is contesting the Lok Sabha elections from Mumbai-North West seat, he said.

The poll staff on duty sent a report to the state electoral office following which the Amboli police on Monday registered an offence against Yadav under relevant provisions of the Representation of People's Act, he said.

Yadav, a gold medallist in the 2010 Commonwealth Games, will face departmental proceedings, the official said.