A 20-year-old Brighton man suffered an injured face when he was attacked and robbed.
The victim was punched in the face in the early hours of Friday (7 November) as he walked through Pavilion Gardens in Brighton.
His phone was stolen in the attack which happened at about 2am.
Sussex Police said that he was attacked by three men.
One of the suspects was described as a black man, 24 to 25 years old, about 5ft 8in tall, with short, shaved dark hair and a small moustache. A second man was described as white and wearing a hooded top.
Anyone who saw the attacks or who has information is asked to phone Sussex Police on 101, email firstname.lastname@example.org or call the independent charity Crimestoppers anonymously on 0800 555111.