Four migrant labourers from Bihar lost their lives due to suffocation while working inside a septic tank in a village in Surat, police said on Wednesday. The incident occurred at a dyeing factory on Palsana-Katodara road on Tuesday evening.

H L Rathore, Deputy Superintendent of Police (DSP), Bardoli Division, said that the senior officials of the factory are being questioned.

“Four workers had gone to clean the (septic) tank and died due to suffocation. Further investigation is underway. We are questioning seniors of the factory…All the four deceased are the residents of Bihar…,” DSP Rathore told ANI.

Police arrived at the scene on Wednesday morning after receiving a call at 6.30am and found the workers dead.

“We received a call at 6:30 am on Wednesday following which a team reached the spot and discovered that four workers had allegedly died due to suffocation,” reported ANI quoting an official.

The deceased workers were living in a colony of the factory, he said.

More details are awaited.