Kolkata, Apr 01 (ANI): The death toll in yesterday's flyover collapse tragedy that took place in Kolkata's Girish Park area has raised to 23. DIG of National Disaster Response Force (NDRF) SS Guleria confirmed this on Friday. He said that the operation is only for the recovery of dead bodies and removal of debris, adding that it was being ensured that there are no dead bodies under the debris. The military and NDRF teams are using heavy earth movers and gas cutting paraphernalia to complete the operation as soon as possible but several more hours will be needed to clear the debris.