The National Disaster Response Force on Sunday rushed three teams to Gujarat's Morbi district where at least 60 people were killed after a suspension bridge over a river collapsed.
NDRF Director General (DG) Atul Karwal told PTI that the three teams have been moved from the state capital Gandhinagar (two teams) and Vadodara (one team).
He said each of the three teams comprises 30 rescuers and four boats and is led by senior officers.
Another team will be airlifted in some time and it will move via road from Rajkot to the accident site, Karwal said.
Gandhinagar is about 240 kilometres from Morbi, Vadodara is more than 300 kilometres away and Rajkot is about 70 kilometres away.
Officials said a Gujarat State Disaster Response Force (SDRF) team closer to Morbi was the first to reach the accident site and the NDRF was mobilised around 7:30 pm.
NDRF rescuers will take around four-five hours to reach the spot, they said.
The NDRF has asked the state government to ensure that its vehicles are given priority clearance on roads so that they can reach the spot as soon as possible.
The British-era suspension bridge on the Machchhu river was crammed with people when it collapsed around 6:30 pm. Several people standing on the bridge fell into the river, according to local officials.
The bridge was reopened for the public on October 26 after extensive repairs and renovation.