Soon after the collapse, police and fire brigade personnel launched a massive rescue operation and pulled out the 25 injured from the debris and sent them to either SSKM Hospital or Calcutta Medical Research Institute for treatment.
The Kolkata Disaster Management Department, the National Disaster Response Force (NDRF) and the state fire department conducted the search operations throughout the night, the officials said. I heard that maintenance of the bridge is entrusted with the PWD and the railways.
Mamata Banerjee, who is on an official tour of North Bengal urged her ministers to immediately reach the spot and help with relief actions.
Televised images from the accident site showed a section about 30m long that had dropped to the ground, reported Associated Press.
The flyover connects Mominpur-Taratala areas of the city.
As rescue efforts continued on Wednesday, several commuters were stuck in traffic as the Diamond Harbour Road was closed. "But we need to remove the debris to find out what is underneath", another official working at the accident site said.
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Prime Minister Narendra Modi termed the incident as "deeply unfortunate" and hoped for the speedy recovery of the injured.
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.
"If the labourers were in the hut at the time of the incident, some lives may have been lost", the Trinamool Congress chief told reporters.
Workers engaged in the Joka-BBD Bag Metro Rail project said that they had built shanties under the bridge to cook and that five to six of their fellow workers were still trapped underneath.
The bridge collapse hit traffic movement to and from vast areas in south-west Kolkata and adjacent South 24 Parganas district. Rescue operations are underway. However, train services in the Sealdah-Budge Budge section, which also passes under the bridge, was not affected, he said.
The police had said Tuesday evening that 27-year-old Soumendu Bag had died in the collapse while 21 others, including three women, were injured.
On March 3, 2013, a curved section of a flyover at Ultadanga in Kolkata connecting VIP Road and E M Bypass collapsed when a goods truck was passing.