A man was found in a doorway with a stab wound to his chest.
Police were called to Langley Lane, Crawley, on Wednesday at 11.15pm.
The 41-year-old victim was taken to the Royal Sussex County Hospital, Brighton, where he is in a stable condition.
Police have arrested a 43-year-old man, who is known to the victim, for assault. He is currently in custody.
Anyone with knowledge of the incident or who witnessed it is asked to contact police on 101 quoting serial 1662 of 23/4.
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