Hertfordshire parents have been urged to make sure they know what their children are viewing online following concerns raised over what has been described as the ‘Momo challenge’.

According to national media reports, seemingly child-friendly sites and platforms were edited by unknown sources and some children’s videos hacked.

Unconfirmed reports suggested a frightening doll-like figure then sends violent images and suggests dangerous ideas to children.

In light of concerns, schools, police and the county council have taken the opportunity to urge parents to make sure they know what their children are looking at on the internet.

Headteacher of Watchlytes School, Alan Gardiner, said: “We consistently teach e-safety across the school community and if an issues arises, we would always deal with it.”

A spokesperson for Herts Police said: “We would always advise parents to be aware of what their children are viewing online and would ask that they read our advice about online safety and take the time to share this information with their children.”

For police advice, visit http://tinyurl.com/y65vzstcA Herts County Council spokesman said: “The online safety of children and young people is a high priority for Hertfordshire County Council and our schools. “We are strongly committed to ensure that children across the county develop digital literacy and resilience skills in order to prepare them effectively for their lives online. “We work closely with Herts for Learning to ensure that schools receive high quality training and regular updated support and information on the shifting pressures and risks of the online world. “We also strongly encourage parent/carer support on online safety as a priority and ensure that professionals working with vulnerable children, including those in the care system, are well trained to provide best support for children, young people and families in response to online risks.”