There's a disturbing new game making its way on social media - and it's caused more than 150 girls to kill themselves.
The Blue Whale suicide game is 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.
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 instruct the youngsters to commit suicide.
Here are some videos - allegedly showing teen girls killing themselves: