President Joe Biden on Tuesday set a new vaccination goal to deliver at least one shot to 70 percent of adult Americans by July Fourth as he tackles the vexing problem of winning over the “doubters” and those unmotivated to get inoculated.

Twenty people were killed, including children, and 49 were hospitalised when a railway overpass collapsed onto a busy road in Mexico City on Monday night.

Three people were killed and more than two dozen others were hospitalized Sunday after a boat capsized and broke apart in rough water just off the San Diego coast during a suspected human smuggling operation, authorities said.

US President Joe Biden is expected to impose new travel restrictions on India starting Tuesday in light of the COVID-19 epidemic, barring most non-US citizens from entering the United States, a White House official told Reuters.

Venezuelan Defense Minister Vladimir Padrino said on Wednesday that eight soldiers were killed in combat amid continuing clashes between the armed forces and illegal armed groups along the border with Colombia.

The Brazilian health regulator Anvisa rejected importing the Russian-made Sputnik V Covid-19 vaccine requested by state governors battling a deadly second wave of the virus that is battering Latin America's largest nation.

The United States can immediately resume use of Johnson & Johnson's Covid-19 vaccine, top health regulators said on Friday, ending a 10-day pause to investigate its link to extremely rare but potentially deadly blood clots.

The US and a handful of other big countries have blocked negotiations at the World Trade Organization involving a proposal spearheaded by India and South Africa that would temporarily waive the intellectual property rights of pharmaceutical companies to allow developing countries to produce vaccines.

The six-wheeled robot has converted some carbon dioxide from the Martian atmosphere into oxygen, the first time this has happened on another planet, the space agency said Wednesday.

The US State Department has added at least 116 countries this week to its “Level Four: Do Not Travel” advisory list, putting the UK, Canada, France, Israel, Mexico, Germany and others on the list, citing a “very high level of Covid-19.”

The United Nations human rights chief on Wednesday welcomed as "momentous" the verdict in the George Floyd case which she said had highlighted how much remains to be done to end systemic racism against people of African descent in the United States.

Police in Columbus, Ohio, shot and killed a Black teenage girl on Tuesday after confronting her while responding to a report of an attempted stabbing, according to authorities and the youngster's family.

Former Minneapolis Officer Derek Chauvin was convicted Tuesday of murder and manslaughter for pinning George Floyd to the pavement with his knee on the Black man’s neck in a case that triggered worldwide protests, violence and a furious reexamination of racism and policing in the US.

The police officer who died following the attack on the US Capitol by supporters of president Donald Trump in January was killed by two strokes, the Washington city coroner ruled Monday.

Jurors yesterday began a first full day of deliberations in the trial of the former Minneapolis police officer charged with murdering George Floyd as US cities braced for a verdict in a case that sparked nationwide protests against racism last summer.

The hard-hit United States passed a hopeful milestone of giving at least one Covid-19 vaccine dose to half its adults, as India locked down its capital New Delhi for a week from last night to try and control a raging outbreak.

Five rockets targeted an Iraqi airbase hosting US soldiers Sunday, wounding two foreign contractors and three Iraqi soldiers, in the latest attack coinciding with tensions between Baghdad’s allies Tehran and Washington.

Five people were hospitalised after being shot and critically injured in a drive-by shooting at a liquor store in Shreveport, Louisiana, CBS-affiliated television station KSLA reported late Sunday.

At least 14 rebels and one Colombian soldier have been killed in combat between guerrillas and the Andean country's military, army sources said.

Eight people were shot and killed in a late-night shooting at a FedEx facility in Indianapolis, and the shooter killed himself, police said.