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.

Two officers and a Border Patrol employee were injured, according to the Department of Homeland Security. A motive is not clear at this time.

Federal agents returned fire at Ryan Louis Mosqueda, who had an assault rifle and was carrying a utility vest, McAllen Police Chief Victor Rodriguez told reporters Monday morning.