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London, Jun 4: Meghan, Britain's Duchess of Sussex, has spoken about events following the death of George Floyd saying she was sorry that children had to grow up in a world where racism still existed and that current events in the United States were "devastating".

"I know you know that black lives matter," Meghan said in a video she recorded for students graduating from her old high school in Los Angeles which was aired on Wednesday.

The death of Floyd has become the latest flashpoint for long-simmering rage over police brutality against African Americans and led to nationwide protests, some violent, with curfews imposed in some cities to quell the disorder.

"For the past couple of weeks I've been planning on saying a few words to you for your graduation and as we've all seen over the last week what is happening in our country, and in our state and in our home town of LA is absolutely devastating," said Meghan, whose mother is African American and father is white.

"First thing I want to say to you is that I'm sorry, I'm so sorry that you have to grow up in a world where this is still present," she said in her message to the girls at the Immaculate Heart High School.

The duchess, a former US actress and wife of Queen Elizabeth's grandson Prince Harry, said she wanted to say "the right thing" and was nervous her words would be "picked apart".

"The only wrong thing to say is to say nothing. Because George Floyd's life mattered, and Breonna Taylor's life mattered, and Philando Castile's life mattered and Tamir Rice's life mattered and so did so many other people whose names we know, and whose names we do not know," she said.

Britain's royal family by tradition does not comment on political issues. However, Meghan and Harry stepped down from their official royal roles at the end of March and are now living in Los Angeles with their baby son Archie.

In her message, the 38-year-old reflected on her own memories of the 1992 LA riots.

"Those memories don't go away and I can't imagine that at 17 or 18 years old, which is how old you are now, that you would have to have a different version of that same type of experience," she said.

"That's something you should have an understanding of, but an understanding of as a history lesson not as your reality. So I'm sorry that in a way we have not gotten the world to the place you deserve it to be."

Beijing:  Around 5,000 people have signed up for the phase I clinical trial of recombinant novel coronavirus vaccine in Chinese city Wuhan where the virus first emerged late last year.

The recruitment for participants ended this week with nearly 5,000 volunteers signing up for the trial, state-run Beijing News reported on Wednesday.

A single-centre, open and dose-escalation phase I clinical trial for recombinant novel coronavirus vaccine (adenoviral vector) will be tested in healthy adults aged between 18 and 60 years, according to the ChiCTR (China Clinical Trial Register).

The trial, led by experts from the Academy of Military Medical Sciences, gained its approval on March 16 and the research is expected to last half a year.

Requiring at least 108 participants, the trial will be conducted in Wuhan, capital of Hubei province, the region worst-affected by the virus in the country, state-run China Daily reported.

Participants will experience 14-day quarantine restrictions after being vaccinated and their health condition will be recorded every day.

Chinese scientists are hastening the development of COVID-19 vaccines through five approaches --- inactivated vaccines, genetic engineering subunit vaccines, adenovirus vector vaccines, nucleic acid vaccines and vaccines using attenuated influenza virus as vectors.

So far, most teams are expected to complete preclinical research in April and some are moving forward faster, Wang Junzhi, an academician with the Chinese Academy of Engineering said.

Wang noted that research and development of COVID-19 vaccines in China is not slower than foreign counterparts and has been carried out in a scientific, standardised and orderly way.

China has stepped up the process to finalise vaccines to counter COVID-19 after Kaiser Permanente research facility in Seattle and Washington stole the march and began human trials.

China lifted tough restrictions on the Hubei province on Wednesday after a months-long lockdown as the country reported no new domestic cases.

But there were another 47 imported infections from overseas, the National Health Commission said. In total, 474 imported infections have been diagnosed in China -- mostly Chinese nationals returning home.

Panic gripped big tech firms like Facebook and Twitter which decided to close their offices from Seattle to London as more employees tested positive for the new coronavirus.

Facebook shut its three London offices till Monday after an employee was diagnosed with COVID-19.

The social networking giant told nearly 3,000 employees in London to work from home after an employee, who is based in Singapore but visited the London offices between February 24-26, was diagnosed with the new coronavirus, Sky News reported on Friday.

"An employee based in our Singapore office who has been diagnosed with COVID-19 visited our London offices on February 24-26.

"We are therefore closing our London offices until Monday for deep cleaning and employees are working from home until then," the company said in a statement.

There have been 163 cases of coronavirus so far in the UK.

Earlier, Facebook recommended all its Bay Area employees in the US to work from home. The latest precautions come after San Francisco announced its first two coronavirus cases on Thursday.

Facebook has also shut its Seattle office until Monday after one of its contractors was confirmed to be infected with the virus. The infected contractor last visited the Facebook office on February 21. King County health officials said all Facebook sites should work from home until March 31.

Twitter shut its Seattle office for a 'deep clean' after an employee developed COVID-19 like symptoms though final result was still awaited.

"A Seattle-based employee has been advised by doctor about likely COVID-19, though still awaiting the final testing," Twitter said in a tweet on Friday.

"While the employee has not been at a Twitter office for several weeks and hasn't been in contact w/others, we're closing our Seattle office to deep clean," the company added.

According to The Seattle Times, at least 14 people have died due to COVID-19 in Washington State till date.

Amazon, Microsoft, Google and Facebook have advised their employees in Washington State to work from home.

Apple has reportedly suggested its employees at California campuses to work from home as an "extra precaution" while new coronavirus cases spread on the west coast in the US, especially Seattle area.

Apple's flagship developers' conference WWDC 2020 in June is also at the risk of getting cancelled as the Santa Clara public health department has warned against large public gatherings. The event draws nearly 5,000 developers from across the world.

The US death toll from the new coronavirus has climbed to 14, according to Johns Hopkins' tracker, with 329 cases reported across the country.