CCTV images in connection with an assault in Milton Keynes have been released by Thames Valley Police.
The victim, a 33-year-old man, was outside the Revolution bar at Xscape, at about 3am on Friday, July 1.
He was approached by a group of men who then pushed him.
The victim ran to the car park but the men followed him and threw an unknown item at his head.
The victim sustained head injuries which required stitches at Milton Keynes General Hospital.
“We are releasing images of these men as we believe they might have vital information about the assault,” said investigating officer, PC Lee Ascott.
“If you recognise the men or have any other information about the incident please contact police immediately by visiting your nearest police station or by calling 101.”