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| Canadians Michael Spavor (L) and Michael Kovrig are being detained in China |
The US state department has urged
Americans to "exercise increased caution" when travelling to China after
a spate of high-profile detentions.
The warning comes as two Canadian citizens remain in detention in China.
Former diplomat Michael Kovrig and businessman Michael Spavor were arrested last month as relations between the two countries worsened.
The pair face accusations of harming national security and, on Thursday, China's top prosecutor said they had "without a doubt" violated the law.
Separately, three US citizens were accused of committing "economic crimes" and barred from leaving China in November.
Victor and Cynthia Liu, who are the children of a fugitive businessman, and their mother, Sandra Han, have reportedly been detained since June.