Bhopal, Nov. 2 -- Four workers died of suspected suffocation while cleaning an overground waste chamber at a hotel in Ujjain district of Madhya Pradesh on Sunday, police said, adding three others who entered the chamber to rescue them also fell ill and were taken to a hospital. Ujjain superintendent of police Pradeep Sharma said the incident took place on Saturday night at Shri Ganga Hotel. "After receiving information about the incident, a team from Madhav Nagar police station rushed to the spot and launched a rescue operation. The workers went into the chamber one after another apparently to clean it but got trapped," Sharma said, adding the workers collapsed on a slippery surface after inhaling toxic gas. The deceased were identified as ...