2 boys aged 7 and 8. Had been playing nicely. Then mum chats with another parent who blocks her view of the children. Few minutes later oldest runs over with tales of youngest hitting a girl and spitting at a boy. Mum goes over to group of teenagers and girl says boy had growled at her then hit her, and spat at her friend.
Mum finds youngest child (who had been hiding) who says he only tapped the girl as he wanted to ask her something and was trying to see how far he could spit. He also said his brother was spitting, who eventually admits he was spitting on the ground.
If you were the mum what would you do next?