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Investigations are underway in Bognor after several people were treated for minor injuries after reports of a noxious substance thrown.
The incident took place just after 4pm on Sunday, Police and emergency services were called to a disturbance in Sturges Road.
One man has been arrested on suspicion of aggravated burglary.
Officers are investigating, and there will be an increased police presence to provide assurance.
Witnesses or anyone with information such as CCTV, mobile phone, or doorbell footage are asked to report it to Sussex Police online, quoting serial 780 of 14/07.