Bullying in Scotland's schools risks being under-reported because incidents are not being recorded properly, experts have warned.
A new system for monitoring bullying incidents was rolled out in 2019, but research by watchdog Education Scotland suggests many schools are not using it.
Teachers and children's counsellors have also told the BBC the problem is under-reported.
The Scottish government has started a review of its anti-bullying guidance.
The review comes as disturbing videos of violent fights and bullying between pupils are increasingly being shared on social media.
Last year Education Scotland sent inspectors to 35 primary and secondary schools to evaluate the recording and monitoring of bullying incidents.
They found only about two-thirds of the schools were fully implementing national guidance by recording incidents of bullying on an education IT system known as Seemis.
