A 15-year-old girl suffered a cut to the head after being hit by a bottle.
Police have now released a CCTV image of a man they would like to speak to in connection with the assault.
The incident happened at about 11.30pm on June 7 in Walsh’s Manor, Stantonbury.
The victim was walking along the underpass between Stantonbury and Great Linford when she had a bottle thrown at her.
The bottle cut the victim’s head and she had to be treated at Milton Keynes Hospital.
Police would like to speak to the man pictured as he might be able to help officers with their investigation.
If you recognise the man, or have any information about the incident, contact PC Lisa Roberts via the Thames Valley Police Enquiry Centre on 101.