The Delhi Police did use firearms to control the mob during the December 15 protests held by students of Jamia Millia Islamia, officers now admit in private. The officers had fired in the air in self-defence as the situation threatened to go out of hand and an entry on it has been found in the daily diary that is maintained at every police station, a senior police officer told NDTV on condition of anonymity. The police have been investigating several videos of the protests that showed as the force investigated several videos of the protest, where officers were seen firing handguns.