Staff Reporter : Ahead of Diwali and the upcoming festive season, Bhopal Police have imposed a complete ban on dangerous carbide guns, carbide cannons, carbide lamps and other blast-producing devices. Police Commissioner Sanjay Kum. Bhopal Police Commissioner Sanjay Kumar has imposed a two-month ban on carbide guns, cannons, lamps and illegally modified firecrackers ahead of Diwali.