A fight at the Diamond Bar versus Diamond Ranch high school football matchup forced game officials to call the game, according to the Inland Valley Daily Bulletin.
Less than for minutes remained when the fight broke out, according to social media. The game was played at Diamond Bar.
The cross town rivalry is billed as the Mayor's Cup. Diamond Ranch took the 2012 cup.
According to the Bulletin, both benches cleared. The game was called at that point and Diamond Ranch was awarded a 34-20 victory.
The game was webcast by Fox Sports West. Footage shows the incident began with 3:15 remaining in the game. Diamond Bar quarterback Tyler Peterson ran the ball for an apparent first down, and was stopped by three Diamond Ranch defenders.
Peterson gets up and appears to have words with Diamond Ranch senior linebacker Matt Preston. Preston shoves Peterson, and the players start milling about on the field.
As tempers flare, Diamond Bar wide receiver Cordell Broadus (No. 21) can be seen in the lower left corner of the screen during the replay of the incident, taking a swing at the nearest Diamond Ranch player.
Players from both benches rushed the field, with the entire Diamond Bar team appearing to be on the field, while some of the Diamond Ranch bench players also came out, while coaches tried to keep control. A handful of people are seen jumping the fence from the Diamond Bar stands to make their way onto the field.