A gang attacked a 25-year-old man with bricks before kicking him repeatedly in the face, police have said.
Five teenagers approached the man on Morgan Street in Dundee at about 2100 BST on Thursday and started throwing bricks at him.
After knocking him to the ground, the youths kicked him, leaving the man with numerous facial injuries.
The victim was taken to Ninewells Hospital in Dundee and was kept in overnight for observation.
The incident happened on the junction with Cardean Street and Park Avenue, Tayside Police said.
The youths were aged between 14 and 18 years old. Police have appealed for witnesses to the attack to contact them.