A man was stabbed at Amelia Park in Worthing early yesterday evening (October 3).
Two air ambulances were observed at the scene.
Sussex Police say they received a report of the incident at 5.45pm:
"A 43-year-old man was taken to hospital with serious injuries.
"A 43-year-old man was arrested on suspicion of grievous bodily harm with intent.
"Anyone with any relevant information is asked to report it online or via 101, quoting 1149 of 03/10."