It was a balmy Thursday afternoon at the residential hostel of the BJ Medical College and the canteen was teeming with students getting lunch.

The room buzzed with the sound of jokes, banter between friends, and the odd bit of academic discussion.

By 13:39 local time, there were at least 35 people in the cafeteria. Some had already collected their food and were lounging around, while others were in the queue waiting for their turn.

The students mixed with doctors and family members. Then, everything changed.

The general hum of the canteen was pierced by the sound of approaching jet engines - and then the room exploded.