White segregationists from around the state joined students and locals in a violent, 15-hour riot on the campus on September 30. Two people were killed execution-style, hundreds were wounded, and six federal marshals were shot. Walker was arrested on four federal charges, including sedition and insurrection against the United States. He was temporarily detained in a mental institution on orders from Attorney General Robert F. Kennedy. Kennedy demanded that Walker receive a 90-day psychiatric examination.