Part of a footover bridge near Vashi Police Naka collapsed on Sunday evening.
A BMC Disaster Control Room official said that the FOB was being dismantled by the Public Works Department when the incident happened at around 4pm on Sunday.
He said that two cranes were deployed to dismantle the steel structure of the FOB and one of the cranes tipped over, leading to the incident.
“No injuries have been reported so far. The debris is being cleared and the incident caused traffic snarls on the arterial road,” the official said.
Traffic police asked motorists travelling to Vashi in Navi Mumbai to take alternate routes.