Northcott Community Special School in Bransholme, Hull, told parents “nasty challenges” are appearing in the middle of videos which are supposed to show Fortnite gameplay or Peppa Pig.
In a tweet, the school said: “We are aware that some nasty challenges (Momo challenge) are hacking into children’s programmes.
“Challenges appear midway through Kids YouTube, Fortnight, Peppa pig to avoid detection by adults.
“Please be vigilant with your child using IT, images are very disturbing.”
“Challenges appear midway through Kids YouTube, Fortnight, Peppa pig to avoid detection by adults”
Northcott Community Special School
The Momo challenge was rumoured to have began as a rogue WhatsApp user targeting children.
Once added as a contact, “Momo” would allegedly try to persuade children to kill themselves.
The creepy avatar — with a stretched smile and bulging eyes — is the work of Japanese artist Midori Hayashi, who is not associated with the challenge.
The NSPCC said adults should teach children ways to cope with peer pressure.
A spokesperson told Mirror Online: “Children can find it difficult to stand up to peer pressure but they must know it’s perfectly okay 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.”
This comes after a mum from Manchester warned that her son had been influenced by the disturbing trend and told terrified schoolfriends “Momo would kill them”.
Last year, cops in Argentina issued a warning about Momo after a 12-year-old girl who committed suicide was believed to have egged-on by another adolescent.
For confidential support call the Samaritans on 116 123 or visit a local branch, see www.samaritans.org for details.