Mysterious blast in Bud Bud, East Barddhaman, 4 injured

A mysterious blast happend in Bud Bud, East Barddhaman. The locals are saying, 4 laborers injured in the blast, 2 injured condition is serious. The police is saying, there is no need of forensic test but could not clarify, how did the blast happen. As per the locals, the gas cylinder was intact after the blast, no smell of gas was there, either. No fire broke o more