Three men were arrested after a man was attacked and taken to hospital with serious injuries.
Sussex Police said they were called to reports of a disturbance in Curtsey Walk, Crawley, at around 8.20pm on June 13.
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A 21-year-old man, a 26-year-old man and a 17-year-old boy, all from Crawley, have been arrested in connection with the incident.
They have all been released on bail pending further enquiries.
A spokesman for Sussex Police said: "Detectives are trying to establish the full circumstances of the incident.
"Witnesses or anyone with any information is asked to contact police online or call 101 quoting Operation Aerial."
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