Two schoolgirls have been arrested in connection with an attack on a 14-year-old girl which was filmed by fellow-pupils on mobile phones.
The victim suffered cuts and severe bruising in the assault by pupils of All Saints College in West Denton, Newcastle, a week ago.
Police said they have arrested and bailed two girls, aged 13 and 14, in connection with the assault.
The girl is making a good recovery, police said.
David Scott, principal at All Saints College, said: "This was a violent and frightening attack on a student and we are working with the police to identify those responsible.
"Although this incident did not take place on college premises this is clearly something that we are very concerned about.
"We make it very clear to all students that this kind of behaviour is totally unacceptable and we will not hesitate in taking the appropriate action against any student found to have been involved."