The incident in Majherhat, southern Kolkata, took place at around 11:30 GMT on Tuesday, when a almost 30-metre long section of the bridge dropped to the ground, the second such incident in the city in less than three years.
Total six people were taken to hospital, Firhad Hakim, a West Bengal government minister, said.
According to locals, a group of migrant construction workers lived under the portion of the bridge that collapsed, and rescue workers have been able to establish contact with at least four of them. "I pray that those who are injured recover at the earliest", said Indian Prime Minister Narendra Modi in a tweet.
"But we need to remove the debris to find out what is underneath", an official working on the accident spot said, reports IANS. Rescue operations were on until late night. However, train services in the Sealdah-Budge Budge section, which also passes under the bridge, was not affected, he said. We are receiving information from the rescue team on the ground (Majerhat bridge collapse in Kolkata).
The Chief Minister, who is on an administrative visit to Darjeeling, said that a high-powered committee headed by the state Chief Secretary would probe the collapse.
The chief minister has called for a detailed investigation..
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Banerjee said that thousands of people pass through the area and the government has to probe the accident.
Majerhat bridge in South Kolkata has collapsed. The DCP traffic Kolkata has said that several routes leading to the collapse site has been temporarily shut and traffic has been diverted. If they were there during the collapse, it is possible that something unfortunate may have happened to them.
"The bridge deserved better maintenance", said Governor Keshari Nath Tripathi. I have directed the administration to take necessary steps for the search and rescue operation.
On March 4, 2013, a road bridge had collapsed in Ultadanga area in the northern part of the city but there was no casualty.
At least 15 people were killed when a flyover under construction collapsed in Kolkata in 2016.