India, Nov. 1 -- Four people died after being trapped inside a waste chamber at Shri Ganga Hotel on Ujjain-Dewas Road in Madhya Pradesh on Saturday night, in an incident that police suspect was caused by suffocation.

The incident took place around 11 pm when four workers entered the chamber to clean it but failed to come out, according to a report by the Press Trust of India.

Ujjain Superintendent of Police Pradeep Sharma said the workers apparently died of suffocation. Police personnel pulled them out and attempted cardiopulmonary resuscitation, but they could not be revived. Doctors later declared all four dead.

The tragedy also left two others ill after they entered the chamber in an attempt to rescue the trapped workers. They were ...