Beijing (CNN) China's latest message to its people: The United States is evil -- don't go there.

In recent days, the government has issued two new travel alerts for citizens heading to the US, while state media has ratcheted up its fiery anti-American rhetoric. It is latest indication of Beijing digging in for a prolonged trade war between the world's two largest economies.

The administration of US President Donald Trump raised tariffs from 10% to 25% on $200 billion worth of Chinese goods on May 10, and later threatened Chinese technology giant Huawei with a potential export ban.

In response, China increased tariffs on $60 billion worth of US goods last Saturday and has pledged to launch other "necessary countermeasures."

On Tuesday, China's Culture and Tourism Ministry warned its citizens of the risks of traveling to the US in an alert, citing frequent recent cases of "shooting, robbery and theft."

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