Relations between the US and China have worsened steadily in recent months as trade disputes - and the Trump Administration's blacklisting of Chinese technology giant Huawei - have sparked broader political tensions.
China issued a travel warning for the us on Tuesday, saying Chinese visitors have been interrogated, interviewed and subjected to other forms of what it called harassment by USA law enforcement agencies.
Chinese tourists are asked to learn about the information about the public security situation and related laws and regulations of tourist destinations, to raise safety awareness and step up precautions to stay safe, state-run Xinhua news agency reported.
Washington later slapped additional tariffs of up to 25% on $200 billion of Chinese goods, prompting Beijing to retaliate. But it said the United States was "disappointed" by the report Beijing issued over the weekend defending China's stance and accusing US officials of backsliding in the talks.
China's Ministry of Foreign Affairs said in one alert that USA authorities had used customs inspections and drop-in interviews to harass Chinese nationals.
In a joint statement, the US Trade Representative's office and the US Treasury reiterated the view that China's negotiators had "back-peddled" on important elements of a deal that had been largely agreed on, including on an enforcement provision.
The statement says. the U.S.is disappointed by China's decision to blame the Trump administration. "Rather, the issues discussed are common to trade agreements and are necessary to address the systematic issues that have contributed to persistent and unsustainable trade deficits".
From January to March, more than 1,350 Chinese students had applied for U.S. student visas but 182 were "unable to make the trip as planned" due to visa issues, accounting for 13.5% of all applicants, Xu told state broadcaster CCTV. "That, I believe, is what a responsible government should do".
Xu Yongji, another Ministry of Education official, told state broadcaster CCTV that 13.5% of all Chinese student visa applicants were "unable to make the trip as planned", citing complications with visas.
Acrimonious rhetoric between Beijing and Washington has steadily increased since talks broke down in early May over USA accusations that Beijing had backtracked on commitments to codify in law changes to its intellectual property and technology transfer practices to address US demands.
The countries have exchanged tit-for-tat tariffs on two-way trade worth hundreds of billions of dollars since Trump fired the first round previous year.
There are hopes that Trump and Chinese President Xi Jinping will meet at the G20 summit this month to ease tensions and jumpstart trade negotiations.