In pics: For rescuers, a battle through the night to save lives

Rescue workers and soldiers worked overnight on Thursday after an under construction flyover collapsed in a congested Kolkata market on Thursday, killing at least 24 people and trapping hundreds underneath giant steel frames and concrete slabs.

Rescue workers and soldiers worked overnight on Thursday after an under construction flyover collapsed in a congested Kolkata market on Thursday, killing at least 24 people and trapping hundreds underneath giant steel frames and concrete slabs.

Firefighters and rescue workers search for victims at the site of an under-construction flyover after it collapsed in Kolkata, India. (REUTERS)

Death toll in the flyover collapse in Kolkata rose to 24 on Friday as the army and other emergency workers battled through Thursday night to rescue dozens of people still trapped under the debris.

Firefighters, soldiers and rescue workers search for victims at the site of an under-construction flyover.

A long section of a road overpass under construction collapsed Wednesday in a crowded Kolkata neighbourhood, with tons of concrete and steel slamming into midday traffic.

A volunteer clears the way for an ambulance carrying a dead body.

Close circuit camera footage showed people, cars, buses, autorickshaws and hawkers getting crushed as the massive concrete structure crashed on the busy street underneath.

Hundreds of emergency workers battled overnight on March 31 to rescue dozens of people still trapped after a flyover collapsed onto a busy street, killing at least 24 people and injuring nearly 100.

Central Kolkata residents watch from their homes as rescue workers and volunteers try to free people trapped under the wreckage of a collapsed flyover.

Vehicles are parked under the wreckage of a collapsed flyover as rescue efforts continue in Kolkata on March 31, 2016.