INDIA, MARCH31:- Many people are feared trapped under the concrete and steel bridge, which fell on a busy road.
Images showed residents using their bare hands to help the rescue effort.
Construction projects in India have often suffered from safety issues with frequent collapses.
Experts say there is a lack of inspections and substandard materials are used.
The flyover has been under construction since 2009 and has missed several deadlines for completion.
Emergency teams have been sent to the area near Girish Park, but witnesses say there is little sign of co-ordinated rescue efforts.