Six people were arrested on suspicion of murder after the death of a man in a recreation park.
The “brawl” took place last night at the Parkdean Resorts on Lydd Road, Camber Sands, near Rye.
Emergency services were called shortly before 11 p.m., but the 58-year-old man died on the spot just after midnight.
The police and medical examiners were at the resort last night and are staying today.
The incident took place at The Showbar, the resort’s entertainment centre, which was showing the first Premier League match when Arsenal played Crystal Palace.
A Sussex police spokeswoman said: “Police arrested six people on suspicion of murder following the death of a man at Lydd Road Leisure Park, Camber Sands, in the early hours of Saturday 6 August.
“At about 22:50 on Friday, August 5, emergency services received a message about a quarrel involving a group of people.
“Despite the best efforts of the paramedics, a 58-year-old man died at the scene shortly after midnight. His next of kin have been informed.
“Six people were arrested on suspicion of murder and are currently in custody.”
Park guests have been asked to refund £100 due to some services not being available due to site investigations.
The Parkdean post added that its team will “contact you to let you know if these events can be held.”
Detective Superintendent John Hull said: “Our investigation is at a very early stage, but I would like to reassure the public that this appears to be an isolated incident without a wider risk of harm.
“Officers are now working to establish all the circumstances, and the immediate family of the victim is supported by specialist officers.”