A man was grabbed and dragged to the floor while his friend was punched in the face during an attack in Wellingborough Road in Northampton.
One of the victims, a 39-year-old man, was leaning against the railings outside the Costcutter store talking to his friend, when he was grabbed from behind and dragged to the floor causing him to bang his head.
The second victim, a 38-year-old man, saw his friend being assaulted by a group of people and, as he went to help him, was punched in the face. He fell to the floor and may have been knocked unconscious for a few seconds and assaulted again.
When he came round, he saw the group running away towards Portland Place.
The incident happened between 11.30pm on Friday April 18 and 12.30am on Saturday April 19.
Witnesses or anyone with information are asked to contact Northamptonshire Police on 101. Alternatively, information can be given anonymously to Crimestoppers on 0800 555 111.