According to ABC News, the US has issued a wide travel alert for ten states in Mexico.
http://abclocal.go.com/kabc/story?section=news/world_news&id=8540132
The department advised avoiding travel to Chihuahua, Coahuila and Tamaulipas, which border the U.S, and in the central state of Durango, as well as sections of 10 other states.
There were also no warnings for the states that are home to Cancun and Cabo San Lucas, two popular tourist destinations for Americans.
http://abclocal.go.com/kabc/story?section=news/world_news&id=8540132