A man was slashed across the throat and stabbed in the chest in an unprovoked attack.
He was walking with a woman and was outside flats in John Street, Brighton, in the early hours of Saturday when the offender lashed out.
The victim alerted door staff at the Ocean Rooms nightclub in nearby Morley Street before he was taken to the Royal Sussex County Hospital, Brighton.
His injuries were not serious.
Police are trying to trace the offender.
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