A worker was killed, 20 others were injured and three went missing after a major fire broke out in a chemical factory in Gujarat's Surat city, officials said on Sunday.

The blaze erupted around 10.30 pm on Saturday in the Anupam Rasayan India Limited factory located in Sachin Gujarat Industrial Development Corporation (GIDC) area with a massive blast in a container storing hazardous chemicals, Surat in-charge Chief Fire Officer Basant Pareek said.