One person was killed and 17 were injured Sunday when a 35-metre portion of a bridge under construction collapsed and fell on passing vehicles, police said, according to dpa.
The accident occurred at 6:45 am (01:15 GMT) in the eastern Laxmi Nagar area, during construction on a section of New Delhi's metro system, police said.
"A 28-year-old bus driver was killed and 17 others were injured. We have concluded rescue operations and all the wounded were moved to two hospitals nearby," police official DK Dham said.
Several vehicles and a crane were buried under the debris, Dham said.
"It could have turned into a big tragedy had it (the accident) not occurred in the early hours of Sunday when traffic is thin," he added.
But news channels reported that two people had died in the incident and nearly 30 were injured.
The reports quoting doctors said the death toll could rise as some of the injured had sustained serious injuries.
Delhi's metro system, being built with Japanese help, transports approximately 700,000 passengers everyday over a network of 65 kilometres.
Construction is underway on another 125 kilometres to spread the network in and around the capital by 2010, when the city hosts the Commonwealth Games.