SHOCKING! Spine-chilling CCTV video of Kolkata flyover collapse - Watch first visuals here

Kolkata: In an unfortunate incident, at least fourteen people were killed when a portion of a flyover under construction here collapsed on Thursday, burying several vehicles.

Here is the shocking CCTV footage of the moment when flyover collapsed:- 

Prime Minister Narendra Modi also expressed grief over the collapse.

The prime minister, who is in Washington, US, also reviewed the rescue operations. 

"Shocked and saddened by collapse of under construction flyover in Kolkata. Took stock of the situation and rescue operations," Modi said in a tweet. 

Home Minister Rajnath Singh has directed the NDRF to engage all its resources for rescue of those trapped under the debris of an under-construction bridge.

The Home Minister told Director General of the National Disaster Response Force (NDRF) O P Singh to send adequate rescue personnel so that all trapped people could be saved, official sources said.