A man had to have 20 stitches to his face after he was attacked by a gang in Londonderry last month.
The 21-year-old man was walking between Rosemount and the Glen Road at about 0600 BST on 30 July when he was approached by about 10 teenagers.
One of the teenagers smashed a glass in the man's face. He was taken to hospital where he was treated for serious facial lacerations.
Police have appealed for anyone with information to contact them.