"China uses exit bans coercively: to compel United States 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 favour of Chinese parties", the announcement said.
"We hope the USA side will make more efforts to promote exchanges and mutual trust between Chinese and USA people rather than the opposite", he said.
"In most cases, U.S. citizens only become aware of the exit ban when they attempt to depart China, and there is no method to find out how long the ban may continue", it said.
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.
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. The Chinese also say they were not briefed on the reasons for Meng's arrest.
The Canadian federal government said on Thursday, that thirteen Canadian citizen - ten public figures, have been detained in China since December 2018, since Canada has arrested Huawei CFO Meng Wanzhou in Vancouver at the request by the United States.
"I and the other members of the delegation will engage with Chinese officials in as constructive way as possible, with the obvious objective of seeing these two Canadians returned safely and as soon as possible", Cooper said.
"Beijing hopes that Washington would contribute more towards building mutual trust and exchanges between two countries, instead of doing the opposite", he added.More news: Near-capacity toilets force Joshua Tree campgrounds to close amid government shutdown
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Kovrig and Spavor were detained shortly after Canadian police arrested Meng, Huawei's chief financial officer, on December 1 in Vancouver at the request of the United States.
Meng faces extradition to the U.S. to face fraud charges, which she denies, linked to allegations of avoiding the USA sanctions on Iran.
That's exactly what the members of the Canada-China Legislative Association say they will do when they arrive in China on Saturday, said Conservative MP Michael Cooper. Eight of them have since been released.
China's top prosecutor said on Thursday that two Canadians detained after Canada arrested a Chinese technology company executive had "without a doubt" violated the law.
The Chinese government has not drawn a direct link between the detention of any Canadian and Meng's arrest.
The pair face accusations of harming national security.
China ratcheted up its accusations against the two detained Canadians on Thursday, with the country's chief prosecutor declaring that the pair broke Chinese law "without a doubt".