Parents are being warned about a freakish new WhatsApp game which could have lead to a child committing suicide.
Likened to the blue whale suicide challenge, which led to 130 teens killing themselves in Russia, "Momo" starts with a shadowy controller sending violent images to children on WhastApp.
Within the game, the children are told to carry out tasks and threatened if they fail to do them, The Mirror reports.
The game has a bizarre avatar, depicting a grotesque woman with bulging eyes taken from the work of Japanese artist Midori Hayashi which is not related to the game.
Momo targets young people and police in Argentina are investigating whether the suicide of a 12-year-old girl in the town of Ingeniero Maschwitz near Buenos Aires is linked to the game.
She filmed a video on her phone shortly before she died, reports the Buenos Aires Times.
Officers suspect someone encouraged her to take her own life and are investigating an unidentified 18-year-old teenager believed to have been in contact with the girl.
A police statement said: “The phone has been hacked to find footage and WhatsApp chats, and now the alleged adolescent with whom she exchanged those messages is being sought.”
They added they believe the teenager's “intention was to upload the video to social media as part of a challenge crediting the Momo game” for the suicide.
Authorities in Mexico have also started an information campaign to warn youngsters and parents about Momo.
The Computer Crime Unit of Tabasco said: “The risk of this challenge among young people and minors is that criminals can use it to steal personal information, incite suicide or violence, harass, extort and generate physical and psychological disorders such as anxiety, depression and insomnia.”
Blue Whale was a horrifying social media phenomenon where youngsters were encouraged to undertake horrific daily tasks including self-harming, watching horror films and waking up at unusual hours.
The tasks, issued by manipulative social media users, escalate until the 50th day when youngsters are told to kill themselves.
Commenting on Blue Whale, the NSPCC say children should not feel pressured into doing anything that makes them feel unsafe.
Where to get help if you're struggling
You don’t have to suffer in silence if you’re struggling with your mental health. Here are some groups you can contact when you need help.
Samaritans: Phone 116 123, 24 hours a day, or email firstname.lastname@example.org, in confidence
Childline: Phone 0800 1111. Calls are free and won’t show up on your bill
PAPYRUS: A voluntary organisation supporting suicidal teens and young adults. Phone 0800 068 4141
Depression Alliance: A charity for people with depression. No helpline but offers useful resources and links to other information
Students Against Depression: A website for students who are depressed, have low mood, or are suicidal. Click here to visit
Bullying UK: A website for both children and adults affected by bullying. Click here
Campaign Against Living Miserably (CALM): For young men who are feeling unhappy. Has a website and a helpline: 0800 58 58 58
A spokesperson said: “Children can find it difficult to stand up to peer pressure but they must know it’s perfectly OK to refuse to take part in crazes that make them feel unsafe or scared.
“Parents should talk with their children and emphasise that they can make their own choices and discuss ways of how to say no.
“Reassuring a child that they can still be accepted even if they don’t go along with the crowd will help stop them doing something that could hurt them or make them uncomfortable.”