A teenager has died after a prank by school bullies went wrong - in full view of the pupils' teacher.
Sergei Casper, 17, was the subject of a stunt that involved wrapping him in cling film so he couldn't move his arms and legs, and putting him feet-first into a toilet.
His classmates then took him back to his classroom in the Russian capital Moscow where his teacher was sitting.
But, still unable to move, Sergei lost his balance and fell towards the teacher's desk, hitting his throat on the table.
Having hit and crushed his esophagus, he then lay on the floor suffocating as his classmates laughed in the background.
By the time they realised he was seriously injured, he was already in a critical condition and despite an ambulance being called, he later died.
Police are now investigating the circumstances surrounding the death, amid claims that Sergei had been a happy and popular student until he joined Polytechnic College Number 8.
It has been claimed classmates started bullying him because of his love of the arts.
One of his friends, named Alexander, told local media: "He was a good guy, he never did anything bad to anyone and he was my friend. But the others just picked on him all the time."
Speaking about the prank, he added: "They seemed to think it was hilarious, and then they decided to take their prize back to the classroom where although the teacher was sitting at her desk, she did absolutely nothing to help him."
The school has denied they were aware of a bullying problem, but also added that those involved in the bullying had been expelled.
One student who took part in the stunt said it was simply a joke that had gone tragically wrong.
But Sergei's parents have demanded to know why the teacher who was in the classroom did nothing, and quote school friends who say that the bullying had gone on for months with nobody taking action.
Police are continuing their investigation.
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