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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Sindhanur: A 12-year-old boy was killed and his mother seriously injured after a man allegedly attacked his elder brother’s family with a knife over a property dispute in Alabanur village of Sindhanur taluk on Wednesday morning.

The deceased has been identified as Nagaraj Siddappa Alvi (12). Amrutha Siddappa (42) sustained serious injuries in the attack. Police said the accused is Basavaraj Rudrappa Alvi, the younger brother of the victim boy’s father.

According to preliminary information, Basavaraj had arrived in Alabanur village on Tuesday and was staying at his mother’s house.

On Wednesday morning, he allegedly went to the house of his brother Siddappa carrying a knife. At the time, Siddappa’s wife Amrutha and children Nagaraj and Dhanush were present in the house.

Police said the accused allegedly attacked them with the knife. Nagaraj died in the incident, while Amrutha and Dhanush suffered serious injuries.

The injured were shifted to the government hospital in the city for treatment.

Deputy Superintendent of Police G. Chandrashekhar visited the spot and gathered information.

Sources said Chinnamma Rudrappa of Alabanur village has two sons Siddappa, who lives in Alabanur, and Basavaraj, who resides in Alliganur village of Siruguppa taluk.

Police suspect the long-standing property dispute between the two brothers led to the fatal attack.