US Secretary of State Mike Pompeo has relaunched his attack on China, claiming there's "significant evidence" to show their role in the coronavirus outbreak.
"There is a significant amount of evidence that this came from that laboratory in Wuhan," he told ABC's This Week.
Pompeo, however, did not dispute US intelligence agencies' conclusion that it was not manmade.
Meanwhile, China's state run newspaper dismissed the allegations, adding that the US official was "bluffing".
"The Trump administration continues to engage in unprecedented propaganda warfare while trying to impede global efforts in fighting the COVID-19 pandemic," the editorial said.
So far, more than 3,568,217 people around the world have been infected, with 248,347 deaths.
US President Donald Trump on Sunday called on Ukrainian President Volodymyr Zelenskiy to stop targeting Russian diesel infrastructure, saying the attacks were causing a shortage of the fuel that is "hurting the world".
Indonesian rescuers were searching on Sunday for 130 people from a passenger ship that sank in the Java Sea after 113 others were evacuated, the country's search and rescue agency said, adding that six people had died.
A Russian drone hit a passenger train on Ukraine's border with NATO member Poland on Sunday, shortly after former British Prime Minister Boris Johnson and other European diplomats had used the same line.
At least five people were wounded in a Russian attack on the Ukrainian city of Odesa on Sunday morning, officials said, a day after strikes on the city killed two people.
Authorities in the Philippines said on Sunday it could take weeks or months to identify the victims of a ferry fire that killed 76 people, as forensic experts begin collecting and comparing DNA samples and investigators determine the cause.