Seven people fell sick after chlorine gas leaked from a cylinder at a water filtration plant in Bhopal, bringing back grim memories of the 1984 gas tragedy in the Madhya Pradesh capital.

A 900 kg chlorine cylinder leaked on Wednesday at the water treatment plant of the Bhopal Municipal Corporation at the Idgah Hills, Shahjanabad area's Assistant Commissioner of Police Umesh Mishra told PTI on Thursday.