The United States had not issued any travel alerts or advisories by late Friday, but some private companies issued their own warnings.

美国在周五前还没有发布旅游预警，但一些公司内部发出了自己的警告。

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Japan and the United States issued urgent alerts yesterday for their citizens to be careful.

昨天，日本和美国都已经发出了紧急的警报，让他们的公民小心。

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In recent weeks, the United States, Canada, France, Italy and Germany have issued alerts about travel to Mexico.

CNN: Violent spillover from Mexico is focus of House hearing

In recent days, the United States, Canada, France, Italy and Germany have issued alerts about travel to Mexico, where drug violence was blamed for more than 5, 400 killings last year.

CNN: Mexico too violent to visit? Tourism chief says no