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Four men were arrested following a disturbance behind a leisure centre.
Police were called to Tamar Drive, Strood, near Strood Sports Centre, yesterday afternoon.
Two people were taken to Medway Maritime Hospital with head injuries.
Four men were arrested on suspicion of affray.
Two men aged between 47 and 48, from Rochester have been bailed pending further enquiries until Tuesday, October 15
Two others, aged 32 and 52 and also from Rochester, has been bailed until Tuesday, October 15.