A 21-year-old had his jaw broken in an apparently unprovoked attack in Wiltshire, police have said.
A spokesman said the man was walking with a friend at about 0215 BST on Friday in Salisbury when they met a group of between eight to 10 youths.
Two of the group followed the pair and repeatedly punched the victim after he walked across Churchill Way.
The man escaped and was taken to hospital where he required surgery for a broken jaw and teeth.
The pair first encountered the youths as they walked through Culver Street car park towards Salisbury College.
The first attacker is described as aged 17 to 18, 6ft tall, with short hair and wearing black trousers and a long sleeved top.
The second attacker is described as shorter than the first, aged about 16 and wearing black jeans, a white top and black shoes.
Anyone with any information is asked to contact police.