Kolkata, Apr 01 (ANI): The death toll in yesterday's flyover collapse tragedy that took place in Kolkata's Girish Park area has risen to 24. West Bengal Chief Minister Mamata Banerjee had last evening confirmed that 21 had died and 85 others injured in the mishap. The rescue work has been going on war footing. 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.