Americans are urged to avoid traveling to all or parts of Mexican states . Mexican President Felipe Calderon declared a crackdown on cartels in late 2006 . Murder , kidnappings and carjackings are cited . 120 U.S. citizens were reported killed in Mexico last year .
Americans are urged to avoid traveling to all or parts of Mexican states . Murder , kidnappings and carjackings are cited . 120 U.S. citizens were reported killed in Mexico last year .