A mother turned a wrestling game in the German city of Aachen into a mass fight involving about 20 people. Police said on Monday that two people were wounded in the quarrel.
According to the police, one of the participants got embroiled in an argument with another contender over who won the game, reported the German news agency (dpa).
The mother of one of the participants intervened in the dispute, which escalated into a fight after she pushed the child who was competing against her son.
Provoked by her action, his family intervened and the argument escalated into a brawl involving other parents.
The situation calmed down as police arrived at the gym. The mother who caused the fight and others involved left before the police arrived, but, the search is ongoing to find them.