India, June 26 -- Three workers died after they allegedly inhaled poisonous gas inside a septic tank at a factory in outer Delhi's Mundka Industrial area on Friday. Police said the workers were deployed to clean the tank.

One of the workers entered the tank and collapsed, following which, the other two entered to save him but also died.

According to the Delhi Fire Services (DFS), a call was received at 12:03pm from factory workers that some persons were trapped inside a septic tank at a factory in Mundka Industrial Area.

The workers were identified as Arun (38), Sandeep (32), and Chand (42), all residents of Sultanpuri.

Police said they had entered the septic tank and allegedly fell unconscious after inhaling toxic fumes.

"Two emerge...