Police have launched a manhunt after a mass brawl broke out among parents watching a baseball game between a group of 7-year-olds.
Footage of the fight shows several adults fighting among themselves, in Lakewood, Colorado.
They were apparently “unhappy” with the game and the judgement of a 13-year-old umpire, Lakewood Police Department said.
The force appealed for information about the identity of a man wearing a white shirt and blue shorts, who can be seen punching another man in the back of the head and sending him tumbling to the ground.
Several people were injured and one was badly hurt, the department added.
Several of those involved received citations for disorderly conduct and fighting in public, John Romero, a spokesman for Lakewood police, told The Washington Post.
He said the brawl began after adults argued over a ruling “one side didn’t like”.
Mr Romero said the man in a white T-shirt and blue shorts could face an assault charge.
Other adults could face similar charges in addition to child abuse charges if they are found to have put any children in danger, he added.