Scientists have known for several months the new coronavirus can become suspended in microdroplets expelled by patients when they speak and breathe, but until now there was no proof that these tiny particles are infectious.

The mayors of New York City and Chicago said on Tuesday they would take President Donald Trump to court if he sent unidentified US government agents to police their cities, pushing back on a threat that has sparked widespread controversy over the use of federal force.

Over 2,000 people were evacuated from three large wildfires in Arizona on Thursday as dry conditions and gusty winds whipped blazes across the US Southwest.

The council of the US city of Minneapolis voted late Sunday to dismantle and rebuild the police department, after the death in custody of George Floyd sparked nationwide protests about racism in law enforcement, pushing the issue onto the national political agenda.

Thousands of protesters ignored a curfew and vows of a forceful police response to take to the Minneapolis streets for a fourth straight night, as the anger stoked by the police killing of George Floyd spread to more cities across the U.S.

Twitter labelled two Donald Trump tweets "unsubstantiated" and accused him of making false claims Tuesday, a first for the social network which has long resisted calls to censure the US president over truth-defying posts.

A newly erected billboard in New York's Times Square shows the number of US coronavirus deaths that its creator says could have been avoided if President Donald Trump had acted sooner -- and it's called the "Trump Death Clock."

The experimental drug remdesivir has been authorized by US regulators for emergency use against COVID-19, President Donald Trump announced Friday.

A gunman who at one point masqueraded as a policeman killed at least 16 people in the Canadian province of Nova Scotia during a 12-hour rampage, authorities said on Sunday, in what was the country’s worst modern-era mass shooting.

Former White House candidate Bernie Sanders endorses onetime rival Joe Biden for president, saying it was time to unite in the effort to defeat Donald Trump in November.

The United States records nearly 1,500 deaths from COVID-19 between Thursday and Friday, according to the Johns Hopkins University tracker, the worst 24-hour death toll globally since the pandemic began.

The WHO and IMF chiefs insisted yesterday that saving lives was a “prerequisite” to saving livelihoods in the coronavirus pandemic -- a crisis they called “one of humanity’s darkest hours”.

President Donald Trump cast doubt on the accuracy of official Chinese figures on its coronavirus outbreak after US lawmakers, citing an intelligence report, accused Beijing of a cover up.

Another 6.65 million US workers file for unemployment benefits last week, the most ever recorded, as the coronavirus forces businesses to shut down nationwide, the Labor Department reports.

President Donald Trump warns Americans to brace for a “hell of a bad two weeks” ahead as the White House projected there could be 100,000 to 240,000 deaths in the US from the coronavirus pandemic even if current social distancing guidelines are maintained.

Researchers in the US and China reported Monday they have developed an artificial intelligence tool that is able to accurately predict which newly infected patients with the novel coronavirus go on to develop severe lung disease.

The United States has deployed Patriot air defence batteries to Iraqi bases to protect American troops recently targeted by Iranian missiles, US and Iraqi military sources told AFP Monday.

President Donald Trump said Sunday that the United States would not pay security costs for Prince Harry and his wife Meghan, appearing to confirm that the royal couple have moved to live in California.

The coronavirus epidemic in the United Kingdom is showing signs of slowing and antibody tests could be ready in days, Neil Ferguson, a professor of mathematical biology at Imperial College London, said yesterday.

New York food banks have become inundated with newcomers deprived of income since the near-total halt of business in the United States’ economic capital.