The Mexican government's stepped-up efforts to clamp down on the drug trade are causing drug-related violence to explode in the country. Ioan Grillo of GlobalPost accompanied the Mexican army on some of its drug-fighting operations and describes them here.

Homeland Security Secretary Janet Napolitano named former federal prosecutor Alan Bersin as the next "border czar" to lead U.S. Customs and Border Protection during a Wednesday news conference in El Paso, Texas.