Eleven injured have been rushed to the nearby SSKM Medical College and Hospital.
#05:20 PM: Rescue teams and ambulances arrive at the spot where part of Majerhat bridge in South Kolkata has collapsed.
"A detailed investigation will be done but right now our main focus is rescue and relief operations". "I pray that those who are injured recover at the earliest", Modi said in a tweet.
Opposition parties blamed the Trinamool Congress government and said its "callousness towards the fix of old bridges" was the main reason for the collapse.
According to CNN-News18, one person has died and 21 are injured.
Governor Kesri Nath Tripathi also dropped in at the accident site to see the rescue operation.
Movement on the Budge Budge-Sealdah railway line has been stopped for the time being. We are receiving information from the rescue team on the ground (Majerhat bridge collapse in Kolkata). "Thankfully my passenger and I escaped unhurt", said Suman Jha, a taxi driver who survived the collapse.
Majerhat bridge in South Kolkata has collapsed. "It is a serious negligence and strict action will be taken", said Banerjee.
Seven workers are feared trapped in the rubble, as locals say their gut-wrenching screams can be heard from above.
At that point, West Bengal Chief Minister Mamata Banerjee tried to shift the blame to previous Left governments for clearing faulty flyover designs. If they were there during the collapse, it is possible that something unfortunate may have happened to them. "As of now there has been no casualty, but search operations are underway, let us wait". On 31 March 2016, the under-construction Vivekananda flyover in the Girish Park neighbourhood collapsed killing 27 people and leaving over 80 were injured.
Tuesday's incident revived the awful memory of the Posta flyover collapse here two years ago.