Sussex Police say officers were called to Sutton Park Road Shortly in the early hours of Sunday morning (February 12) following reports of a large group of people fighting in the street outside the Tesco supermarket.
During the incident, which took place shortly after midnight, police say a 24-year-old Newhaven man suffered a stab wound to the chest.
He was taken by ambulance to the Royal Sussex County Hospital in Brighton where he has been detained for treatment. He is currently in a stable condition.
Three people, all from Seaford, were detained in connection with the incident. Police say all three – two 19-year-olds and a 20-year-old – were arrested on suspicion of causing grievous bodily harm with intent.
Police say one of the 19-year-olds and the 20-year-old were also arrested on suspicion of possessing the class B controlled drug, cannabis. The second 19-year-old was further arrested on suspicion of possessing the class A controlled drug, cocaine.
Both 19-year-olds have been bailed until March 31 and the 20-year-old until April 1 while enquiries continue.
Anyone who saw what happened or who may have other relevant information is asked to email police on [email protected], quoting serial 41 of 12/02.
They can also report details online at https://sussex.police.uk/contact-us/response-to-appeal/ or phone 101.
Or they can contact the independent charity Crimestoppers anonymously on 0800 555 111 (www.crimestoppers-uk.org).
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