Kolkata: A team from the state Criminal Investigation Department's (CID) Bomb Detection and Disposal Squad (BDDS) visited the blast spot at Naihati in North 24-Parganas on Friday afternoon. Inspector General (IG) of state Special Task Force (STF) Ajay Kumar Nand also visited the spot and took a stock of the situation. Sources informed that due to the impact of the blast, a portion of the spot where the blast took place had caved in, measuring about 10 feet. Apart from police, local civil administration also visited the damaged houses on Friday. Chairman of Naihati Municipality Ashok Chatterjee also visited the damaged houses and arranged for tarpaulins and dry food..