Over 5,000 volunteers in Wuhan sign up for clinical trials over Covid19 vaccine

Washington, May 28: US President Donald Trump has warned social media giants that his government could "strongly regulate" or "close them down" after Twitter fact-checked one of his tweets for the first time.

"Republicans feel that Social Media Platforms totally silence conservatives voices," Xinhua news agency reported citing Trump as saying in a tweet to his 80 million followers on Wednesday.

"We will strongly regulate, or close them down, before we can ever allow this to happen."

Later in the day, he said that Twitter "has now shown everything we have been saying about them... is correct" and vowed "big action to follow".

The President's remarks came after Twitter slapped a warning label on one of his tweets on Tuesday, cautioning readers "Trump makes unsubstantiated claim that mail-in ballots will lead to voter fraud".

It was in response to Trump's tweet, without providing evidence, said: "There is NO WAY (ZERO!) that Mail-In Ballots will be anything less than substantially fraudulent."

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It is unclear what regulatory steps the president could take without new laws passed by Congress, the BBC reported.

The White House is yet to offer further details.

Earlier, Trump has accused Twitter of interfering in this year's US presidential election scheduled for November, saying the company was "completely stifling free speech, and I, as president, will not allow it to happen".

With more than 52,000 tweets currently to his name, Trump is a prolific tweeter and relies on the platform to disseminate his views to millions of people.

He has used Twitter to launch attacks on opponents, with targets ranging from North Korean leader Kim Jong-un to his political rivals in the US.

In 2017 he used anti-Muslim tweets aimed at London Mayor Sadiq Khan to serve a domestic political purpose of warning about immigration.

Beijing, May 24: The Chinese virology institute in the city where COVID-19 first emerged has three live strains of bat coronavirus on-site, but none match the new contagion wreaking chaos across the world, its director has said.

Scientists think COVID-19 -- which first emerged in Wuhan and has killed some 340,000 people worldwide -- originated in bats and could have been transmitted to people via another mammal.

But the director of the Wuhan Institute of Virology told state broadcaster CGTN that claims made by US President Donald Trump and others that the virus could have leaked from the facility were "pure fabrication".

"Now we have three strains of live viruses... But their highest similarity to SARS-CoV-2 only reaches 79.8 percent," she said, referring to the coronavirus strain that causes COVID-19.

US demands immediate start to WHO review

The United States called on the World Health Organisation on Friday to begin working immediately on investigating the source of the novel coronavirus, as well as its handling of the response to the pandemic.

One of their research teams, led by Professor Shi Zhengli, has been researching bat coronaviruses since 2004 and focused on the "source tracing of SARS", the strain behind another virus outbreak nearly two decades ago.

"We know that the whole genome of SARS-CoV-2 is only 80 percent similar to that of SARS. It's an obvious difference," she said.

"So, in Professor Shi's past research, they didn't pay attention to such viruses which are less similar to the SARS virus."

Conspiracy rumours that the biosafety lab was involved in the outbreak swirled online for months before Trump and US Secretary of State Mike Pompeo brought the theory into the mainstream by claiming that there is evidence the pathogen came from the institute.

The lab has said it received samples of the then-unknown virus on December 30, determined the viral genome sequence on January 2 and submitted information on the pathogen to the WHO on January 11.

Wang said in the interview that before it received samples in December, their team had never "encountered, researched or kept the virus."

"In fact, like everyone else, we didn't even know the virus existed," she said. "How could it have leaked from our lab when we never had it?"

The World Health Organization said Washington had offered no evidence to support the "speculative" claims.

In an interview with Scientific American, Shi said the SARS-CoV-2 genome sequence did not match any of the bat coronaviruses her laboratory had previously collected and studied.

Seoul, Jun 24: North Korea on Wednesday said leader Kim Jong Un suspended a planned military retaliation against South Korea, possibly slowing the pressure campaign it has waged against its rival amid stalled nuclear negotiations with the Trump administration.

Last week, the North had declared relations with the South as fully ruptured, destroyed an inter-Korean liaison office in its territory and threatened unspecified military action to censure Seoul for a lack of progress in bilateral cooperation and for activists floating anti-Pyongyang leaflets across the border.

Analysts say North Korea, after weeks deliberately raising tensions, may be pulling away just enough to make room for South Korean concessions.

Pyongyang's official Korean Central News Agency said Kim presided by video conference over a meeting Tuesday of the ruling Workers' Party's Central Military Commission, which decided to postpone plans for military action against the South brought up by the North's military leaders.

KCNA didn't specify why the decision was made. It said other discussions included bolstering the country's "war deterrent".

Yoh Sang-key, spokesman of South Korea's Unification Ministry, said Seoul was "closely reviewing" the North's report but didn't further elaborate.

Yoh also said it was the first report in state media of Kim holding a video conferencing meeting, but he didn't provide a specific answer when asked whether that would have something to do with the coronavirus.

The North says there hasn't been a single COVID-19 case on its territory, but the claim is questioned by outside experts.

Kim Dong-yub, an analyst from Seoul's Institute for Far Eastern Studies, said it's likely that the North is waiting for further action from the South to salvage ties from what it sees as a position of strength, rather than softening its stance on its rival.

"What's clear is that the North said (the military action) was postponed, not cancelled," said Kim, a former South Korean military official who participated in inter-Korean military negotiations.

Other experts say the North would be seeking something major from the South, possibly a commitment to resume operations at a shuttered joint factory park in Kaesong, which was where the liaison office was located, or restart South Korean tours to the North's Diamond Mountain resort.

Those steps are prohibited by the international sanctions against the North over its nuclear weapons programme.

The public face of the North's recent bashing of the South has been Kim Yo Jong, the powerful sister of leader Kim Jong Un, who has been confirmed as his top official on inter-Korean affairs.

Issuing harsh statements through state media, she had said the North's demolishing of the liaison office would be just the first in a series of retaliatory action against the enemy South and that she would leave it to the North's military to come up with the next steps.

The General Staff of the North's military has said it would send troops to the mothballed inter-Korean cooperation sites in Kaesong and Diamond Mountain and restart military drills in frontline areas.

Such steps would nullify a set of deals the Koreas reached during a flurry of diplomacy in 2018 that prohibited them from taking hostile action against each other.

Also condemning the South over North Korean refugees floating anti-Pyongyang leaflets across the border, the North said Monday it printed 12 million of its own propaganda leaflets to be dropped over the South in what would be its largest ever anti-Seoul leafleting campaign.

It wasn't immediately clear whether Kim's decision to hold back military action would affect the country's plans for leafleting. The North's military had said it would open border areas on land and sea and provide protection for civilians involved in the leafleting campaigns.

The North has a history of dialling up pressure against the South when it fails to get what it wants from the United States. The North's recent steps came after months of frustration over Seoul's unwillingness to defy US-led sanctions and restart the inter-Korean economic projects that would breathe life into its broken economy.

Nuclear negotiations between Pyongyang and Washington largely stalled after Kim's second summit with President Donald Trump last year in Vietnam, where the Americans rejected North Korea's demands for major sanctions relief in exchange for a partial surrender of its nuclear capabilities.