Police are appealing for witnesses after it was alleged a child was assaulted with a bottle in Angmering.
Officers were called to the incident at the Bowl park, Mayflower Way at around 4pm on December 21.
A 13-year-old boy was taken to hospital and has since been discharged.
It is believed the suspect was between 5’8” and 6’1”, of skinny build and was wearing all black.
Witnesses or anyone with any information is asked to contact Sussex Police online or call 101 quoting serial 902 of 21/12