ROUND ROCK, Texas — A Texas high school football coach accused of ordering players to knock down a referee who allegedly hurled racial insults at the team has resigned, and state officials warned Thursday punishments to others may be coming.

Former bosses for Mack Breed, who was an assistant coach at John Jay High in San Antonio, told a governing board they believe he ordered at least one player to retaliate against referee Robert Watts during the waning moments of a game on Sept. 4.

Video from the game shows two players lining up behind Watts, who was the umpire, and then blindsiding him from behind.

Breed did not attend the hearing near Austin of the University Interscholastic League, which oversees high school sports in Texas. His attorney released a lengthy statement that does not admit to telling the players to strike Watts but acknowledges that Breed made “some regrettable comments.”