SAN DIEGO — A former University of San Diego star basketball player, another former player and a former assistant coach were charged with running a sports betting business to affect the outcome of games, federal authorities said Monday.

The indictment names Brandon Johnson, the school’s all-time leading scorer who finished his college career last year, Thaddeus Brown, an assistant coach at the school in the 2006-07 season, and Brandon Dowdy, who played at USD in the 2006-07 season and at the University of California, Riverside, from 2008 to 2010. Seven other people were also charged.

Authorities did not say how the alleged scheme worked and said they were trying to determine its scope, including the number of games allegedly involved.

The indictment alleges that Johnson, 24, took a bribe to influence a USD game in February 2010 and solicited someone else this January to affect the outcome of USD basketball games while playing for the Dakota Wizards, a development team for the NBA’s Memphis Grizzlies.

U.S. Attorney Laura Duffy didn’t name the USD opponent in the February 2010 game, saying only that Johnson was the school’s starting point guard at the time.

Johnson “was intricately involved in both the illegal gambling business and in the sports bribery schemes,” Duffy said at a news conference.

There was no attorney listed for Johnson in court documents.

The indictment, handed up Friday by a federal grand jury in San Diego and unsealed Monday, alleges that Brown, 32, of El Cajon, and Dowdy, 22, of San Diego, solicited someone to affect the outcome of a game in February. Authorities said the game was at the University of California, Riverside.

Authorities said USD was fully cooperating and was not accused of any wrongdoing. Duffy and Keith Slotter, head of the FBI’s San Diego office, met Monday with school officials.

“They are rightly concerned,” Duffy said. “They were very responsive.”