A man was attacked in Brighton as he was putting rubbish in a communal bin on Monday afternoon (18 November).
Sussex Police has issued an appeal for witnesses to help them trace the attacker.
The force said that the victim, a 19-year-old, was attacked at about 4.25pm when a man wearing a balaclava attacked him in Park Crescent Road, Brighton.
The victim was treated by paramedics for scratches to his hand and stomach.
The attacker was described as a man aged 20 to 30 years old, 5ft 10in tall and of slim build.
He was wearing a black balaclava and a green bandana which covered his face. He was also wearing a silky green hooded top with the hood up and blue tracksuit bottoms.
Anyone who saw the attack is asked to call Sussex Police on 101 or the independent charity Crimestoppers anonymously on 0800 555111.
