Delhi minister Rajendra Gautam today set up a vigilance committee to look into sewer deaths in the city.
Deputy Commissioner of Police, Shahdra district, Nupur Prasad said the father of the deceased, who was working with them inside the sewer, and a fireman, who went to rescue them, have been admitted to hospital after they too complained of suffocation and are now under observation.
According to the city police, Yusuf and his sons Jahangir, 24, and Ijaz, 22, went to clean a sewage plant at Aggarwal Fun City Mall in Anand Vihar in east Delhi on Saturday.
The incident took place at around 1 pm. "The family has been doing this for several years, but appropriate safety gear should have been given to them", Sub-Divisional Magistrate (Vivek Vihar) Harminder Singh said.On Saturday afternoon, the family arrived with a cart and entered the tank located at the "minus two basement".
A senior police officer privy to the case told IANS that the "mall authorities" had said that maintenance work was outsourced and they were not responsible for it. The brothers were residents of Sahibabad in Uttar Pradesh, which borders Delhi. "Head Constable Mahipal from the fire department then went in to rescue the trio, but he also inhaled the gas, hit his head against the wall of the tank and sustained injuries". Izaz died on his way to Dr Hedgewar Aarogya Sansthan, while doctors have kept Yusuf under observation, police said.
She added that Yusuf and Mahipal were undergoing treatment at the hospital and their condition was critical.
In the last two months alone, a total of seven sewer deaths were reported in Delhi in separate incidents.
Earlier this week, three labourers died, while another was left battling for life after inhaling poisonous gases inside a manhole in southeast Delhi's Lajpat Nagar area.
A similar tragedy had claimed four lives in south Delhi's Ghitorni.