All this drug cartel violence is slowly moving north into America. America has not sealed the border so there is no control of the illegal immigrants entering America. Now they're building "tanks" as the escalation of the drug war continues.
source: http://www.dailymail.co.uk/news/article-1394823/Mexican-war-drugs-reaches-new-low-drug-gangs-hang-rival-members-city-centre-bridges.html
source1: http://www.mcclatchydc.com/2011/06/06/115327/mexican-drug-gangs-building-own.html
