On Friday, August 12, New Mexico governor Bill Richardson declared a state of emergency in four counties. The following Monday, Arizona governor Janet Napolitano did the same. And the federal government is less than pleased.

"The U.S. Border Patrol is telling its agents to just lay low and report on what they see," he said. "They are instructed to determine the size of the [Mexican military] unit, the number of personnel, the direction of travel."

More than 200 incursions by the Mexican military of the U.S. southern border have been documented since the late 1990s, Rep. Ted Poe (R-Texas) said in an interview.

"Our federal government denied it occurred until the Texas sheriffs took photos," he said. "There is no nation in the world that would allow this invasion to occur except for the United States."

The Guardsmen, through an Arizona Border Patrol official, confirmed that the incident appeared to be an intelligence-gathering exercise designed to ascertain what the National Guard’s response would be to certain tactics. It is not an isolated incident, and many such probes have been reported by the Guardsmen assigned to the area. Though no shots were fired during this particular incident, shots have been fired near and in the vicinity of the soldiers at the EIT site in other situations, though not at the soldiers themselves. It is not clear from the uniforms if the Mexican soldiers were official Mexican federales or mercenaries hired by the drug cartels.

Since then, follow-on news reports have included statements from the Border Patrol that no shots were fired. This was confirmed today by Major Paul Aguirre, a Public Affairs Officer (PAO) for the Arizona National Guard. Rumors have circulated that the Guardsmen were not armed, and thus unable to defend themselves - and that is not the case. Both Major Aguirre and Rob Daniels, a Public Information Officer (PIO) for the Arizona Border Patrol, state that all Guardsmen assigned to EITs are armed, specifically with M16s and sometimes a sidearm. As well, there have been some contradictory news reports that stated the gunmen came “within yards” of the Guardsmen, while other reports state that the gunmen were approximately 100 yards away. Mr. Daniels clarified that the gunmen came as close as 100 yards to the Guardsmen. He also stated that the Guardsmen did not “retreat” but tactically repositioned themselves to maintain surveillance of the group of armed men while simultaneously radioing for Border Patrol agents. He asserted that the Guardsmen had followed their protocols perfectly, and that their services were invaluable to the Border Patrol agents.