Police already have 'named suspects'
He says police will now be pushing for CCTV to be installed in Egerton Park.
Police are among partners being consulted by Rother council over the planned 1.5m Lottery-aided refurbishment of the park.
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Hide AdThe Inspector said a member of the public had called police at 8.10pm on Friday to say around 20 youths were fighting another boy in the park.
On Tuesday he said police attending the scene later found Willem Haymaker being helped by friends in Parkhurst Road.
"The area was searched completely. Several youths were stopped in the area but no suspects were located.
"The group of friends could not provide any description of the attackers other than that they were all wearing hoodies."
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Hide AdHe said an ambulance had been called because Willem's eye was closing.
"The park has been the subject of directed patrol activity and we have increased patrols in the park.
"We have also increased seizures of alcohol there. This, with vandalism, is a problem in the park but we have not had violence like this there before.
"The problem is that we don't have CCTV in the park and it is open through the hours of darkness."
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Hide AdThe Inspector said that despite the upsurge of violence over the past two weekends - four young men will shortly be interviewed again over the attack at Ravenside which left a Tesco employee with broken jaw and bleeding to the brain - the latest 90-day figures still showed that violent crime was down by 5.7% (six offences) over the preceding period.
On Wednesday Inspector Mann said: "We believe this group come from the Sidley area.
"Police already have the names of several suspects and arrests WILL be made.
"We have had this picture put about in Sidley and shown to parents.