>BLUE Whale is a horrifyingly dangerous suicide challenge which appears to goad vulnerable teens into killing themselves.
>The 'challenge' has been linked to at least 130 teen deaths across Russia and police in the UK are also warning parents.
> Tragic schoolgirl Yulia Konstantinova, 15, posted this picture of a blue whale on Instagram shortly before jumping to her death
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>Tragic schoolgirl Yulia Konstantinova, 15, posted this picture of a blue whale on Instagram shortly before jumping to her deathCredit: The Siberian Times
>What is the Blue Whale online suicide game?
>The Blue Whale suicide game is believed to be a social media group which is encouraging people to kill themselves.
>There are hundreds of thousands of posts relating to the sick trend on Instagram.
>It's thought a group administrator assigns daily tasks to members, which they have to complete over 50 days.
>The horrific tasks include self-harming, watching horror movies and waking up at unusual hours, but these gradually get more extreme.
>On the 50th day, the controlling manipulators behind the game reportedly instruct the youngsters to commit suicide.
>Two girls died this week after they were hit by a freight train near Krasnoufimsk in the Urals, Russia.
>The pair – named as Yulia Medvedeva, 13, and I. Gabdulkhakova, 15 – were hugging close to the rail line when they were hit by the engine and dragged down the track.
>The driver slowed the train but could not avoid hitting them.
>Yulia died at the scene, while the other girl was rushed to hospital – but doctors were unable to save her.
>The two girls had deleted their social media accounts shortly before their deaths, it was reported.
> Yulia Medvedeva, 13, was killed by a train near Krasnoufimsk, Russia
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>Yulia Medvedeva, 13, was killed by a train near Krasnoufimsk, RussiaCredit: VK.com
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>Is Blue Whale in the UK?
>Essex Police informed a school in Basildon about the Blue Whale challenge and the headteacher wrote to parents about it.
>The letter, sent by Woodlands School in Basildon, was seen by Essex Live and read: "We have discovered a game through the police that we feel you should be aware of.
>"It is called The Blue Whale Game and is played via many social media platforms."
>No deaths in Britain have been linked to the game, but police officers have posted online warnings to parents.
>Devon and Cornwall Police PCSO Kirsty Down tweeted: "Whoever created this horrible game is sick!
>"Parents: Please be aware of this 'game' talk to your children about it if concerned."