China last month detained two Canadians, a former diplomat and a businessman, on charges of activities that "endanger China's security". All three are American citizens, as China doesn't recognize dual citizenship.
The advisory also warned of the "coercive" practice of exit bans, when authorities prevent people from leaving China. Meng is now out on bail but faces possible extradition to the US over allegations of fraud.
"US citizens may be detained without access to. consular services or information about their alleged crime", the advisory reads.
That number has been stable in recent year and compares to the 900 Canadians detained in the United States for similar reasons, the official said.
The advisory also said that Americans affected by exit bans have been "harassed and threatened" by authorities.
"Chinese authorities have asserted broad authority to prohibit US citizens from leaving China by using 'exit bans, ' sometimes keeping USA citizens in China for years", the State Department advisory read.
Make sure your United States passport has a valid Chinese visa and keep it with you.
"We're building a relationship with them that's critically important because the better you get to know one another the more they will discuss things frankly and openly".
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A delegation of Canadian legislators is now en route to China to discuss the incarceration of Kovrig and Spavor, along with other factors in the strained relationship between Beijing and Ottawa.
"The Chinese, I've learned through my many years involved in Canada-China relations, they build on long term-relationships".
Their detentions followed the arrest of Huawei chief financial officer Meng Wanzhou, who was held in Vancouver at the request of USA prosecutors on 1 December.
USA prosecutors have accused Meng of misleading banks about transactions linked to Iran, putting the lenders at risk of violating Washington's sanctions.
The detentions were confirmed by a Canadian government official, according to the newspaper.
In Beijing, China's top prosecutor said Thursday that the two Canadians had "without a doubt" violated the law.
Beijing has also defended its decision to bar the three USA citizens from leaving the country in November.
At a press conference Friday, China's Foreign Ministry spokesman, Lu Kang said the country welcomes all foreigners, but that they are expected to follow the rule of law.