BISBEE, Ariz. (AP) — A Border Patrol agent was shot to death Tuesday in Arizona near the U.S.-Mexico line, the first fatal shooting of an agent since a deadly 2010 firefight with Mexican bandits that spawned congressional probes of a botched government gun-smuggling investigation.

The agent and a colleague were on patrol in the desert near Naco, Ariz., about 100 miles from Tucson, when shooting broke out shortly before 2 a.m., the Border Patrol said. The second agent was shot in the ankle and buttocks, and was airlifted to a hospital.

Authorities have not identified the agents, nor did they say whether any weapons were seized at the site of the shooting.