Tragedy unfolded in the bustling city of Kolkata after a flyover under construction collapsed on to moving traffic below, killing at least 14 people with as many as 150 people feared trapped.

In no time Twitter went active with pictures, videos and messages flooding in from different corners, giving a clear picture of the magnitude of devastation.

Here are few of them:

There were some good samaritans:

Some well known personalities also tweeted encouraging rescue operations: