- Three bodies have been identified
- The single-lane bridge was built in the British colonial era
- Divers, boats and helicopters have been deployed in the rescue efforts
The bridge gave way about 2 a.m. local time Wednesday, said Rakesh Ranjan, deputy commandant of the National Disaster Response Force and Civil Defence (NDRF).
The state passenger buses were carrying 22 people: 18 passengers, two conductors and two drivers.
Three bodies have been recovered and identified so far, Sushma Satpute the sub-divisonal magistrate of Raigad district told CNN. One of the bus drivers was among the dead.
High pressure from the flooding of the Savitri River caused the collapse, Chief Minister of Maharashtra state Devandra Fadnavis said in a video statement on Facebook.
The single-lane bridge was built in British-era colonial times.
A rescue effort is underway with four NDRF teams, navy helicopters, boats and divers at the scene.
Fadnavis said Indian Prime Minister Narendra Modi had "assured all help from the central government."
A newer bridge, which runs parallel to the collapsed road, has resumed traffic, Fadnavis said on Twitter, citing a Raigad district official.
India has been hit by severe flooding in the past few days, which has killed 163 people and affected as many as 7.78 million, according to the NDRF.