India, Feb. 21 -- At least two sanitation workers were killed, and another was injured after they descended into a sewer to clean it in outer Delhi's Narela on Friday, police said. The workers, hired by a private contractor, were cleaning a sewer outside Manisha Devi Apartments when the incident occurred.

Delhi Police officials said they have registered a case against unknown persons and are searching for the contractor and the individual who hired them. They have not yet been identified, police said.

The incident was reported around 12.15 pm when locals alerted police that two workers had entered the sewer but had not come out. Before help could arrive, a third worker attempted to rescue them and also got trapped, police said.

The vic...