Thames Valley Police is appealing for witnesses after a 16-year-old girl was assaulted last weekend.
At around 5.30pm on Saturday 21 March the victim, a 16-year-old girl, was assaulted by two other girls behind a block of flats on Silbury Boulevard, next to Milton Keynes Library.
The victim was taken to hospital for treatment and has since been discharged.
The offenders are both described as white girls in their teens.
The first girl is described as around 5ft 6ins tall, of muscular build, with long blonde hair tied in a pony tail. She was wearing a grey puffa-style coat with a black fur hood, a black long-sleeved top, black jogging bottoms and black Nike trainers.
The second girl is described as around 5ft 5ins tall, with brown curly hair tied in a high pony tail. She was wearing a black puffa-style coat, a black t-shirt, black jogging bottoms and Nike trainers.
Investigating officer, PC Emma Clarke, based at Milton Keynes police station, said: “I am appealing for anyone who may have witnessed this incident, or who has any information, to please come forward.
“The victim sustained an injury to her knee that has left her unable to work at the moment.
“If anyone has any information, please contact police by making a report online, quoting reference 43200094262.
“Alternatively, if you wish to remain anonymous, you can contact the independent charity Crimestoppers on 0800 555 111.”