The incident took place at a New Year’s bash, the police said.

Police sources said a case was registered late Tuesday evening in Mehrauli Police Station.

According to police sources, Tarun and Tejpal had gone to a party in a hotel in Connaught Place, accompanied by a Delhi Police officer and a Railway Police inspector. “They then went to a Mehrauli farmhouse, where they passed lewd remarks on a group of people,” a Mehrauli police official said.

What ensued was a clash and, to disperse it, the Railway Police inspector took out his gun. “But one of the assailants got hold of a stick and hit the inspector on his head,” the police official said. “After that, the two inspectors fled the scene; they left the gun behind.”

Police officials said all four were taken to the Railway Hospital; their condition is reported to be stable.