A CISF jawan Neelkant Bihara allegedly shot down his senior officer, Inspector Guru Padadsheet, in Kolkata on Sunday. Furious over Padadsheet raising an objection to his phone ringing inside the CISF camp at the Kolkata Port Trust, Bihara fired three rounds from his rifle at his senior. Bihara, who had been denied leave twice earlier, later surrendered, said the police.