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Judicial Watch has done a lot of work in this area and has obtained records from the Department of Homeland Security (DHS) that show Mexican military incursions occur quite often and go unpunished by the U.S. For instance, the DHS documents reveal 226 incursions by Mexican government personnel into the U.S. occurred between 1996 and 2005. In 2007 alone, 25 incursions occurred along the U.S.-Mexico border involving Mexican military and/or law enforcement. The problem has only gotten worse over the years, according to the records obtained in the course of JW’s ongoing investigation." http://www.judicialwatch.org/blog/2014/04/mexican-military-holds-border-patrol-at-gunpoint-inside-u-s/
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The documents which are incomplete and do not contain all of the relevant data nonetheless indicate an increase in the number of incursions in 2008 and 2009. Judicial Watch’s analysis of the data shows:
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In the latest Mexican military incursion into the United States, two heavily armed camouflaged soldiers from Mexico actually crossed 50 yards inside Arizona and held American Border Patrol agents at gunpoint in a tense confrontation.
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Armed with assault-style weapons [H&K G3 rifles - added], the Mexican soldiers retreated back south after a 35-minute standoff as if nothing ever happened and the Obama administration just let it slide… [/FONT]
there were 23 incidents in the Tucson and Yuma sectors of Arizona since 2010, including three this fiscal year alone.[FONT=Helvetica, Arial, sans-serif]
" [/FONT]http://www.judicialwatch.org/blog/2014/04/mexican-military-holds-border-patrol-at-gunpoint-inside-u-s/