One of the few sane commenters on that site asks the pertinent question

Would it be too much to ask WHERE this took place? Was the incident 300 yards into the US, or was this 10 miles from the border? The real question is “could this have been an accident or was a major effort made to cruise well into the US to fire on the guys on the ground?”

In fact it happened 100 yards inside the US border.

Early this morning, a Mexican law enforcement helicopter crossed approximately 100 yards north into Arizona nearly 8 miles southwest of the Village of San Miguel on the Tohono O’odham Indian Nation while on a drug interdiction operation near the border. Two shots were fired from the helicopter but no injuries or damage to US property were reported. The incident is currently under investigation.

- Andy Adame, U.S. Border Patrol Spokesperson

Really, must we freak out over every incident without waiting for the facts?

Sure, there is always a possibility of something worse and there should be an investigation, but the most obvious explanation is that they were in the middle of some drug operation that went slightly awry.

Thank God no one was injured.