Serum Institute fire: Know what caused the massive blaze that killed 5 people

Maharashtra Health Minister Rajesh Tope said that the initial fire was caused by some ongoing welding work at the site. The fire broke out at about 2:45 pm at an under-construction building where vaccine production was supposed to start after a month. The fire broke out at 4th and 5th floor of the SEZ3 building. BCG vaccine laboratory was there at 3rd floor of the same building but that is unaffected.