A major gas leak from a chemical plant in Visakhapatnam, Andhra Pradesh occured early on Thursday and quickly spread to villages in a five-kilometre radius, killing at least 11 people and affecting thousands. The styrene gas leaked around 2.30 am on Thursday. Styrene is an organic compound used in the manufacture of polymers/plastic/resins. It is manufactured in petrochemical refineries. It can react with oxygen in the air to mutate into styrene dioxide which is more lethal. To know more watch this video.