-Chinese nationals. The warning likewise warns about China's utilization of exit bans that would deny US subjects from leaving the nation, some while keeping them in China for few years.
"We are deeply concerned by the arbitrary detention by Chinese authorities of two Canadians last month and call for their immediate release", said Austen.
The advisory by the United States warned of so-called exit bans which prohibit foreign citizens from leaving China, the New York Times reported.
China uses exit bans coercively: "to compel USA citizens to participate in Chinese government investigations, to lure individuals back to China from overseas, and to aid Chinese authorities in resolving civil disputes in favor of Chinese parties", the State Department warned.
"US citizens under exit bans have been harassed and threatened".
Updating a travel advisory, the State Department maintained its previous guidance that Americans should "exercise increased caution" in China but stopped short of discouraging visits. They could also face "prolonged interrogations and extended detention for reasons related to "state security".
"This number has remained relatively stable", the official said.
The December arrest in Canada of Chinese tech giant Huawei's Chief Financial Officer Meng Wanzhou on Washington's request also raised the spectre of potential retaliatory arrests of Americans or Canadians in China.
Cathay Pacific to honour bargain $973 first class flight prices
Typically, Cathay Pacific would charge around A$23,200 (US$16,000) for first-class or business-class tickets from Vietnam to NY . Other flights from Vietnam to United States airports were also offered at drastically reduced rates.
December 13: Conservative Leader Andrew Scheer accuses Trudeau of taking a "naive approach" to China, leaving Canada without "the leverage that we might otherwise have" to resolve the situation.
US prosecutors have accused her of misleading banks about transactions linked to Iran, putting the banks at risk of violating USA sanctions.
"China's economy is facing some headwinds and so is going to want to attract businesspeople, is going to want to show it's open for normal business", he said. Eight of them have since been released.
Beijing, however, said the detention of these two men was not linked to Meng's arrest, but analysts called it a "tit-for-tat" action.
Reports say the travel guidance issued by the USA comes after the detentions of two Canadians in China last month and came amid heightened diplomatic tensions in the wake of the arrest in Canada of a top executive in Chinese telecoms giant Huawei.
The pair face accusations of harming national security.
The Chinese regime's top prosecutor said January 3 that two Canadians detained after Canada arrested Huawei executive Meng Wanzhou had "without a doubt" violated the law.