A 32-year-old supervisor was on Monday arrested for alleged negligence which led to the death of five people due to asphyxiation while cleaning a septic tank at DLF Green Apartments in west Delhi's Moti Nagar area, police said.

Ajay Chaudhary, an engineer working with JLL company-- tasked with the maintenance of the sewer tank-- was arrested, Deputy Commssioner of Police (West) Monika Bhardwaj said. During the probe, it was found that the labourers, Sarfaraz, Pankaj, Raja, Umesh and Vishal who died on Sunday after inhaling toxic gases were not provided adequate safety gear and were only given masks, police said.