coronavirus vaccine factory.Smoke can be seen filling the sky as worried onlookers watch in horror.In another video, smoke billows out of windows in the higher levels of the building.The blaze erupted at the Serum Institute of India (SII) in the western city of Pune earlier today (January 21).The cause of the fire is not yet known but it is believed to have broken out at an under-construction building which was not housing the vaccine.India Today claims four people were trapped inside, of which three have been rescued.SII is developing the Covishield vaccine, created by Oxford University and AstraZeneca, for India and other low and middle-income countries.The Pune Police Comissioner told local news agency ANI: "The fire broke out at Manjri.