Chennai, May 27 -- The National Human Rights Commission (NHRC) on Tuesday suo motu cognizance of the death of three workers due to asphyxiation at a dyeing unit in Tiruppur district last week and issued notices to the Tamil Nadu government seeking a detailed report within four weeks.

Four workers entered into a sewage tank to clean it without any protective gear at a private industrial unit in Tiruppur district on May 19, of which three died of asphyxiation and the other person was admitted to a hospital in a critical condition.

They were reportedly, employed in the Dyeing Mill in the Karaipudur area of Tiruppur and asked to clean the sewage tank of the factory, NHRC said on Tuesday.

Taking suo motu cognisance based on media reports...