A judge has dismissed federal employees from a wrongful death lawsuit filed by the family of a slain Border Patrol agent over the botched "Fast and Furious" gun operation, noting congressionally-mandated remedies are already in place for when an agent dies in the line of duty.

The American Civil Liberties Union is seeking a federal government probe into allegations of constitutional rights violations by U.S. Border Patrol agents in Arizona.

Authorities say a U.S. Border Patrol agent has been arrested on suspicion of smuggling drugs.

The U.S. Border Patrol agent killed last week in a shooting in southern Arizona apparently opened fire on two fellow agents thinking they were armed smugglers and was killed when they returned fire, the head of the Border Patrol agents' union said Sunday.

The Border Patrol has identified the agent who was fatally shot in southern Arizona while working along the U.S.-Mexico border.