Police said they were called to Lintot Square, Southwater, at around 8.20pm to reports of an assault.
One man was found with a stab wound to his back and is currently being treated by paramedics.
Police said officers attended the scene and are carrying out searches and enquiries in the area.
Anyone who saw what happened or who has any other information is asked to contact police online or by calling 101 quoting serial 1149 of 04/04. Alternatively, they can contact the independent charity Crimestoppers anonymously on 0800 555 111.
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Police at the scene. Picture by Eddie Mitchell SUS-210504-090102001 Photo: eddie mitchell
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Police at the scene. Picture by Eddie Mitchell SUS-210504-090151001 Photo: eddie mitchell
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Police at the scene. Picture by Eddie Mitchell SUS-210504-090312001 Photo: eddie mitchell
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Police at the scene. Picture by Eddie Mitchell SUS-210504-090301001 Photo: eddie mitchell
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Police at the scene. Picture by Eddie Mitchell SUS-210504-090151001 Photo: eddie mitchell
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Police at the scene. Picture by Eddie Mitchell SUS-210504-090312001 Photo: eddie mitchell
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Police at the scene. Picture by Eddie Mitchell SUS-210504-090301001 Photo: eddie mitchell
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Police at the scene. Picture by Eddie Mitchell SUS-210504-090249001 Photo: eddie mitchell