Due to increasing violence in Mexico, especially along the U.S. border, the U.S. State Department has updated its travel warning for Americans to include 11 Mexican states.
The most dangerous border areas, according to the warning, are Northern Baja California, Nogales, Northern Sonora, Ciudad Juarez, Chihuahua, Durango, Coahuila, Zacatecas, Monterrey, Nuevo Leon, Tamaulipas. Elsewhere in Mexico, the warning also covers Sinaloa, Southern Sonora, San Luis Potosi, Nayarit, Jalisco, Michoacán, and Guerrero and Morelos.
"Violence along Mexican roads and highways is a particular concern in the northern border region," Friday's warning says, broadening a warning issued in July, 2010.
It warns American travelers to "be especially aware of safety and security concerns when visiting the northern border states of Northern Baja California, Sonora, Chihuahua, Nuevo Leon, and Tamaulipas. Much of the country's narcotics-related violence has occurred in the border region.
"More than a third of all U.S. citizens killed in Mexico in 2010 whose deaths were reported to the U.S. government were killed in the border cities of Ciudad Juarez and Tijuana," the warning says. "Narcotics-related homicide rates in the border states of Nuevo Leon and Tamaulipas have increased dramatically in the past two years"
U.S. citizens have been murdered in carjacking and highway robbery incidents in many parts of the border region, the warning said, adding that carjackers have used a variety of techniques, including bumping moving vehicles to force them to stop and running vehicles off the road at high speed. The warning also cited incidents of human trafficking in some parts of the country.