Updated

A three-year federal investigation into groups of suburban white teens crossing into Mississippi's capital city to attack blacks has grown to 10 indictments and six convictions.

The most recent indictments — two men and two women — were made public Wednesday.

The June 2011 death of James Craig Anderson, who was run over by a pickup truck outside a Jackson hotel, sparked a broader investigation into reports that groups of young white men and women would drive from the mostly white Rankin County into majority-black Jackson to assault blacks.

Prosecutors said the suspects usually sought out the homeless or people under the influence of alcohol for verbal and physical harassment.

Defense attorneys say they are waiting for government documents that would shed more light on the case against the four indicted Wednesday.