Firefighters and rescue workers search for victims at the site of an under-construction flyover after it collapsed in Kolkata, India, March 31, 2016. [Photo/Agencies]

"The flyover, which has been under construction in the middle of a crowded commercial area in central Kolkata for the past six years, came crashing down around 12.30 pm (local time). So far, 20 bodies have been pulled out of the debris," a police official said, on condition of anonymity.