Five people died and 15 were injured Sunday in the collapse of a bridge construction site in New Delhi, authorities said.

Concrete slabs buried the workers at a construction site for the city's metro rail network, authorities told CNN.

The slabs collapsed when a metal support beam gave way, Metro Rail Corp. spokesman Anuj Dayal told the broadcast news service.

Construction on new metro lines has been stepped up in advance of the city's hosting of the Commonwealth Games next year.

In October, part of another under-construction metro bridge collapsed in the city, pinning a bus and killing its driver.