Shocking footage of CCTV shows the horrifying memento a student shoots a fellow classmate after a squabble.
The video shows an Indian student pulling a handgun out of his school bag before aiming it at his classmate and shooting him inside the classroom in front of terrified students.
The victim can be seen falling to the ground while the two boys involved in the incident sprint off away from the scene.
The incident at the Industrial Training Institute in Sonipat, northern India, involved students aged 16 or 17 and is said to have followed a bust-up two days earlier.
Two friends are said to have smuggled a gun into school before allegedly shooting the pupil in front of a dozen classmates.
Photographs taken after the incident showed blood on the classroom floor.
The victim is in a critical condition at Pandit Bhagwat Dayal Sharma Post Graduate Institute of Medical Sciences in Rohtak.
Rahul Dev, Deputy Superintendent of Police, said the search for the perpetrators is still ongoing.