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Washington (CNN) | The United States has renewed a travel alert to Mexico, citing increased violence in the country.
The alert, issued Sunday by the State Department, is in effect until August 20 and supersedes an alert issued August 20, 2009.
"Recent violent attacks have caused the U.S. Embassy to urge U.S. citizens to delay unnecessary travel to parts of Michoacan, Durango, Coahuila and Chihuahua ... and to advise U.S. citizens residing or traveling in those areas to exercise extreme caution," the alert says.