My son was threatened and harassed violently on gorilla tag by multiple players what do I do to have this properly taken care of so they don't continue this I'm worried about how this may affect him emotionally and physically thanks

My son created a code on gorilla tag and gave it out so people could join and play along one player decided to take the credit for himself and my son was upset and the other player started harassing him and so did the other players they threatened hi...