TEACHING unions last night called on all schools to introduce a clear mobile phone policy after police were called to a popular Liverpool girls’ school.

Staff called in officers after finding mobile phone footage which appeared to show a 13-year-old pupil having sex.

Police yesterday confirmed they were examining the video, which also shows the teenager performing a sex act.

Parents said the clip had “done the rounds” of Holly Lodge girls’ college, on Queens Drive, for the past week.

Julia Tinsley, headteacher at the 1,400-pupil West Derby school, confirmed the matter was now in the hands of the police.

Merseyside police said detectives were now analysing the clip. Criminal proceedings could follow if the sex scenes involving a minor prove genuine.

Parents said pupils said the footage had been “sent across the school and city” by mobile phone.

One angry father said: “My daughter came home very upset at what she’d seen. The footage shows a girl in her year having sex and engaged in a sex act, which for the past week has been doing the rounds at the school and across the city.”

A Merseyside Police spokesman said: “We are investigating the distribution of inappropriate images at a Liverpool secondary school via the use of mobile phones.”

The girl in the clip and her friends will be interviewed as part of the probe.

The spokesman said: “We are working in partnership with staff at the school, who moved quickly on this matter.”

Headteacher Mrs Tinsley said: “It would be inappropriate to comment other than to say the matter is now in the hands of the police.”

In its last Ofsted inspection, the school was ranked good, the second highest grade.

Last night, Julie Lyon-Taylor, Liverpool’s National Union of Teachers representative, said: “First and foremost, this is a child protection issue and the girl involved should be helped and protected.

“All schools should have a clear mobile phone policy although this can’t stop pupils texting or sending each other material outside of school hours and lessons.

“Some parents argue their children have mobile phones for safety reasons but we are now seeing problems with students taking videos and posting them on internet sites.

“Teachers and parents can’t ignore issues of phone videos when they arise and I would hope discussions take place within school.

“We should be talking to children about the use of mobile phones and what and what’s not acceptable usage.

“Many pupils are distressed if they see inappropriate material and maybe some will have been distressed in this instance, so it’s appropriate to talk them about what’s happened.”