Madison police Lt. John Stringer says 16-year-old Hammad Memon and his mother, Safia Memon, were arrested Friday evening in Dallas.
Hammad Memon is accused of the fatal shooting of 14-year-old Todd Brown at Discovery Middle School in February 2010 in Madison, Ala. He was out of jail, having been released to his parents' custody, and faced trial June 18.
Stringer said a judge revoked bail for the dual-citizenship teen on Friday after authorities learned he had obtained a Pakistani passport earlier in the week and was considered a flight risk.
Authorities say they'll begin the process to extradite them to Alabama next week.