While Europe tightened virus restrictions to face the threat of a second wave of COVID-19, US President Donald Trump on Wednesday found himself in the crosshairs of Facebook and Twitter because of a video in which he claims children are "almost immune" to the new coronavirus.

Face masks are now mandatory even outdoors in some cities in France Face masks are now mandatory even outdoors in some cities in France Photo: AFP / VALERY HACHE

The worldwide death toll crossed 700,000 as the two US social media giants took action against Trump for spreading what they called "misinformation" about the virus.

Several European countries and cities reimposed tighter restrictions, including a "wake-up week" in Greece and new face mask and quarantine rules elsewhere.

Philippine authorities set up checkpoints, cancel domestic flights, and order millions of people to stay home again as it reimposes stricter quarantine restrictions in Manila and its surrounding areas amid rising spread of the coronavirus. Police check ID Philippine authorities set up checkpoints, cancel domestic flights, and order millions of people to stay home again as it reimposes stricter quarantine restrictions in Manila and its surrounding areas amid rising spread of the coronavirus. Police check IDs at multiple checkpoints and the Manila airport is left nearly empty, with some passengers left stranded. Photo: AFPTV / Ron LOPEZ

The US tallied another 1,262 deaths and 53,158 cases Wednesday, marking 157,930 total deaths and more than 4.8 million cases -- making it by far the worst-hit country in the world.

A total of 703,640 deaths have been recorded so far around the world, according to an AFP tally compiled from official sources as of 0300 GMT Thursday.

The travel sector, and airlines in particular, has borne the brunt of the economic fallout of the pandemic The travel sector, and airlines in particular, has borne the brunt of the economic fallout of the pandemic Photo: AFP / PETER PARKS

Europe remains the hardest-hit region with 211,764 fatalities, but the number of deaths is rising fast in Latin America, with 208,329 deaths recorded.

Deaths from coronavirus, by region and country, as of August 5 Deaths from coronavirus, by region and country, as of August 5 Photo: AFP / Romain ALLIMANT

Announcing the re-introduction of restrictions in Greece, government spokesman Stelios Petsas told Mega TV: "We are trying to awaken people with messages and daily announcements on additional measures," citing travel, social gatherings and public transport as major spreading concerns.

Wearing a face mask is mandatory in usually crowded places in the city of Amsterdam Wearing a face mask is mandatory in usually crowded places in the city of Amsterdam Photo: ANP / Remko DE WAAL

Restrictions reimposed on the northeast Scottish city of Aberdeen included the closure of all indoor and outdoor hospitality venues starting late Wednesday as First Minister Nicola Sturgeon referred to what could become a "significant outbreak."

Toulouse in southwest France made face masks compulsory, with more French cities expected to follow suit.

A Colombian health worker takes a break outside Medellin's General Hospital, amid the COVID-19 pandemic A Colombian health worker takes a break outside Medellin's General Hospital, amid the COVID-19 pandemic Photo: AFP / JOAQUIN SARMIENTO

And Germany included Belgium's Antwerp province on its list of regions requiring arriving travelers to quarantine for 14 days unless they can show a negative virus test.

In Belgium, one of the country's biggest meat processing plants, Westvlees, sent 225 staff home to quarantine after a cluster of coronavirus cases was discovered.

Graphic showing the highest national death tolls around the world since the start of the coronavirus crisis, as of August 6. Graphic showing the highest national death tolls around the world since the start of the coronavirus crisis, as of August 6. Photo: AFP / John SAEKI

Switzerland added mainland Spain to a quarantine list of 46 countries as well as Singapore and Romania.

In the Netherlands, similar mask-wearing measures came into force in Rotterdam and in some busy neighborhoods of Amsterdam, including its famous red-light district.

In the Netherlands, mandatory mask-wearing measures came into force in Rotterdam and in some busy neighborhoods of Amsterdam, including its famous red-light district In the Netherlands, mandatory mask-wearing measures came into force in Rotterdam and in some busy neighborhoods of Amsterdam, including its famous red-light district Photo: ANP / Remko DE WAAL

A truck at the meat processing plant Westvlees in Westrozebeke, Belgium after several employees tested positive for the coronavirus A truck at the meat processing plant Westvlees in Westrozebeke, Belgium after several employees tested positive for the coronavirus Photo: AFP / François WALSCHAERTS

In an extraordinary move late Wednesday, Facebook removed a video clip about the virus from Trump's account.

It was the first time the social network has taken down one of the president's posts for violating its content rules -- for "claims that a group of people is immune from COVID-19 which is a violation of our policies around harmful COVID misinformation," a Facebook spokesperson told AFP.

US President Donald Trump speaks to the press as he departs the White House for the G7 Summit in France US President Donald Trump speaks to the press as he departs the White House for the G7 Summit in France Photo: AFP / Alastair Pike

Twitter meanwhile said it had blocked Trump's official campaign account, also for a "misinformation" violation over a tweet containing the same video, in which Trump made the case for reopening US schools starting in September.

Soon thereafter, the @TeamTrump account was active, suggesting the contested video had been taken down.

Also in the United States, New York mayor Bill de Blasio, announcing new checkpoints at access roads into the city, said: "We're not going to let our hard work slip away and will continue to do everything we can to keep New Yorkers safe and healthy."

The virus killed more than 32,000 people in the city, which was one of its first epicenters in the United States.

One of Brazil's leading indigenous chiefs, 71-year-old Aritana Yawalapiti, died Wednesday of respiratory complications caused by COVID-19.

Brazil, South America's largest country, is driving a surge in Latin America and the Caribbean. It has recorded nearly 2.9 million cases, and more than 97,000 deaths, nearly half the region's 208,329 fatalities.

Meanwhile the death toll continued to rise in Peru, which reported a new daily record of 221 deaths and 7,734 new cases, according to Health Ministry figures, bringing the total COVID-19 deaths to 20,228, and 447,624 confirmed cases -- though total deaths could be closer to 50,000 when considering suspected cases, according to press reports.

Peru, population 33 million, has the third highest death toll in Latin America after Brazil and Mexico.

In South Africa, the hardest-hit country in Africa, some 24,000 health workers have contracted the coronavirus and 181 have died since March, Health Minister Zweli Mkwize said.

But he added: "We haven't got to the stage where we don't have hospital space for patients."

In Afghanistan, the health ministry said nearly a third of the population -- or 10 million people -- has been infected with the novel coronavirus.

The world's hope of ending the current cycle of outbreaks and lockdowns rests on finding a treatment, which has proved elusive so far.

J&J, via its subsidiary Janssen, received $456 million in March.

Clinical trials on humans began in China for a potential coronavirus vaccine developed by German pharmaceutical group BioNTech with Chinese company Fosun Pharma.