A 32-year-old labourer died while cleaning a Delhi Jal Board sewer in northwest Delhi's Jahangirpuri area, police said Sunday.
The man was identified as Dooman Ray, a native of Katihar in Bihar, Additional Deputy Commissioner of Police (northwest) AK Lal said.
Mr Ray was rushed to the Max Hospital in Shalimar Bagh, where he was declared brought dead.
Police got to know about the incident at around 7.30 am. They were told that Mr Ray was brought dead from the Delhi Jal Board Pump House in Jahangirpuri, Mr Lal said.
During investigation, it was revealed that Mr Ray was working in a sewer there with three other workers.
"The Delhi Jal Board (DJB) has given the contract to KK Spun India Ltd for repair and rehabilitation of sewerage in Jahangirpuri. Today at about 5.30 am, Ray went down in sewer hole to open the valve and died," said Mr Lal.
Delhi Jal Board said they are looking into the matter. "The DJB is extremely sorry to hear about the loss. The matter is being looked into and action will be taken accordingly," the statement said.
In September, five men died after inhaling toxic fumes while working in a sewage treatment plant in west Delhi's Moti Nagar area.