UPDATE from the AP:
NOGALES, Ariz. (AP) -- The leader of a union representing Border Patrol agents says an agent who was fatally shot north of the Arizona-Mexico border was trying to catch bandits who target illegal immigrants for robbery.
National Border Patrol Council President T.J. Bonner says 40-year-old Brian A. Terry was waiting with three other agents in a remote area north of Nogales on Tuesday when a gun battle with the bandits began.
Border Patrol spokesman Eric Cantu would not confirm Bonner's account, but noted that authorities have four suspects in custody and are searching for a fifth.
The FBI is investigating the shooting and didn't immediately return a call seeking comment Wednesday morning.
ORIGINAL STORY BELOW.
TUCSON, Ariz. (AP) -- The U.S. Border Patrol says that one of its agents has been shot to death after a confrontation in southern Arizona.
Border Patrol spokesman Eric Cantu confirmed the agent's death to The Associated Press on Wednesday morning.
Cantu tells KTVK-TV the agent is identified as Brian Terry. Cantu says Terry was shot and killed after confronting several suspects near Rio Rico north of Nogales.
At least four people are in custody and possibly one more remains at large.
Cantu says the FBI and local sheriff's officials are investigating.