Hillarys police boss Alex Ryan said the situation escalated after the offender began abusing the umpire of a five-a-side indoor match at Craigie Leisure Centre on April 19.
He punched a fellow spectator in the stomach when he attempted to intervene.
‘A spectator approached the referee and said ‘you are the worst referee I have ever seen’,’ Senior Sergeant Ryan said.
‘The victim stepped in between the two and said ‘you can’t say that, you need to leave’.
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‘The person of interest then punched him in the stomach.’
He said the matter had been referred to the inquiry team, which would continue to investigate.