Surat, June 7 -- Four people died in Surat on Sunday after being exposed to toxic gas while cleaning an Effluent Treatment Plant (ETP) tank at a jewellery company in the Ashwini Kumar area, police said.

A case of accidental death has been registered.

DCP Zone-1 Surat, Alok Kumar, said that the incident took place during the routine cleaning of a tank that collects waste from jewellery cleaning operations. He added that four workers went for the cleaning this morning; one fell in, and the others who attempted to rescue him also fell, leading to four fatalities.

"The waste product of the jewellery cleaning flows into a septic tank, which undergoes regular cleaning to remove the accumulated sludge. This cleaning operation is carried out e...