NACO, AZ – Federal investigators are looking into the possibility the deadly shooting of a Border Patrol agent in southern Arizona Tuesday was the result of friendly fire, according to a Thursday report.

NBCNews.com said the investigators are trying to determine if officials accidentally shot each other, despite initial reports which claimed armed criminals were responsible for the incident. Read more.

U.S. Border Patrol Agent Nicholas Ivie was killed in the early morning shooting in Naco. Another agent was injured and a third agent escaped unharmed.

Federal police have arrested two men who may be connected with the fatal shooting just north of the Mexico-Arizona border, a Mexican law enforcement official said Thursday.