Beijing: China on Monday warned students and academics on the "risk" of studying in the United States, citing an uptick in visa denials and delays amid a trade war and other tensions.
The education ministry in a statement urged students to "strengthen risk assessment... and make relevant preparations".
The ministry said Chinese students and academics have experienced visa restrictions, delays in obtaining them, and visas with shorter duration.
China is the biggest source of international students on US campuses, with 360,000 of them last year, or a third of the foreign student body, with many paying full tuition.
The warning comes after FBI director Christopher Wray said in April that Beijing has used Chinese graduate students and researchers, among others, in its economic espionage efforts in the United States.
Last month, Republicans in the US Congress introduced legislation aimed at barring Chinese military scientists from obtaining visas to study or work in the United States.
The bills in the House and Senate would compel the White House to identify a list of research and scientific institutions that the president determines are affiliated with or funded by the People's Liberation Army.
The PLA Visa Security Act would prevent people currently or formerly employed or sponsored by such entities from entering the United States on student or research visas.
China's state-run Global times has published accounts from several Chinese academics saying their 10-year visas to the US were cancelled, with officials citing concerns about links to Chinese intelligence.
US scholar Michael Pillsbury, who advises US President Donald Trump on China, said his visa to enter the country for a forum earlier this year was blocked in apparent retaliation.
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Ranchi (PTI): Tribal icon Birsa Munda's great-grandson Mangal Munda, who was undergoing treatment at a hospital here after being injured in a road accident, died of "cardiovascular failure" on Friday, an official of the health facility said.
He was 45.
Mangal Munda breathed his last at 12.30 am at the state's apex health facility - Rajendra Institute of Medical Sciences.
Munda sustained severe head injuries after he fell from the roof of a passenger vehicle in Jharkhand's Khunti district on November 25.
"Birsa Munda's kin Mangal Munda died of cardiovascular failure around 12.30 am. He was on a ventilator after being critically injured. We tried our best to save him but failed," RIMS Medical Superintendent Dr Hiren Birua told PTI.
Prime Minister Narendra Modi's office, Union Health Minister JP Nadda and the Jharkhand Chief Minister's office were in touch with the RIMS authorities in connection with Munda's treatment.