The gun trade has been a long running bone of contention over the Rio Grande, with Mexico complaining that most of the firearms used by cartel assassins are purchased from U.S. stores. Of almost 100,000 guns seized at Mexican crimes scenes since 2007, 68% have been traced to the United States. The U.S. gun lobby argues that heavier weapons such as the Soviet rockets and fragmentation grenades come from the other direction, smuggled from Central America.

via Mexico’s Drug Lords Ramp Up Their Arsenals with RPGs | TIME.com.