A man was stabbed in the stomach when he opened his front door.
The attacker, wearing a blue Hawaiian shirt, lunged forward with a 6in blade but caused only a shallow wound.
The victim, 50, was in his flat in Arundel Court, Westdene, Brighton, just before midnight last Thursday when the assault happened.
The knifeman was 30 to 40, 5ft 10in, stocky with short, blond hair.
Police are trying to establish a motive and they have appealed for witnesses to call them on 0845 6070999.
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