The incident took place at the entrance of the U.S. Border Patrol sector annex in McAllen, a city in southern Texas that borders Mexico, according to the DHS spokesperson. Mosqueda fired dozens of rounds toward the building and agents inside, Rodriguez said.

The shooter, 27-year-old Ryan Louis Mosqueda, arrived at the facility with an assault rifle and a utility vest when federal agents returned fire and killed him. Three people were injured in the shooting.