A man was assaulted by six men in an unprovoked attack while walking in Northampton town centre.
The attack happened in Bridge Street between 1.30am and 2.30am on December 16.
A man was walking up Bridge Street towards town, near NBs, when a group of about six men attacked him.
He sustained a broken cheek bone, a broken jaw and required surgery as a result of the attack.
The men are described as all white and all around 6ft. One of the men was of thin build and had a dark hair and a beard. Another of the men was aged 21-24.
Witnesses or anyone with information should call Northamptonshire Police on 101.