China

The US, India and the UK are among the nations that have introduced mandatory testing for arrivals from China.

BBC report the country has recently seen a surge in Covid cases following the easing of its strict controls.

And there are fears that cases and deaths are being vastly underreported.

China's last daily Covid update, on 24 December, reported fewer than 5,000 cases - but some analysts claim the daily caseload is already over two million, and could peak at almost four million this month.

The pileup took place on a bridge that was shrouded in heavy morning fog, which caused multiple vehicles to crash, according to state-owned The Global Times.

Photos from the scene show the long multi-lane bridge, stretching across fields and the Yellow River, strewn with vehicles crammed into each other. Cars, cargo trucks, lorries and other vehicles can be seen in the pileup.

CNN reports in videos filmed from the ground, the air is still thick with fog. One clip shows a truck sliding forward, crashing into several smaller cars, as sirens ring in the distance.

State media reports the crash was caused by heavy fog in the area.     

The country is seeing a surge in cases since the lifting of its most severe restrictions earlier this month.

The latest official figures appear to show a relatively low number of new daily cases.

However, there are concerns that these numbers are an underestimate due to a recent reduction in Covid testing.

BBC reports the government reported only 2,097 new daily cases on Sunday.

Reuters reports most cases are asymptomatic infections and mild cases, with no special treatment required, the National Health Commission said in a statement.

"Asymptomatic persons and mild cases can be isolated at home while strengthening health monitoring, and they can transfer to designated hospitals for treatment in a timely manner if their condition worsens," the NHC said.

But they're not the only ones who have been ordered to get tested: an official notice states that some forms of sealife are also expected to join the latest mass-testing drive.

In recent weeks, Xiamen's Jimei Maritime Pandemic Control district committee issued a notice saying that when fishermen return to their ports "both fishermen and their seafood must be tested".

It was only her third tournament back from an Achilles injury and it has been a stuttering return to action for the twice U.S. Open champion, who also exited in the opening round in Toronto last week, retiring with lower back pain.

For Zhang, doubles champion in Cincinnati last year, it was her first singles win at the event since 2014.

"Naomi she is amazing but I don't know she is maybe not really feeling good today," said Zhang. "But for sure today - not her best today."

The investments include tax breaks for companies that build computer chip manufacturing plants in the US.

Business groups have long pushed for more government support, citing the need to reduce reliance on China.

A global shortage of microchips increased the urgency of their calls.

Top Senate Democrat Chuck Schumer said the bill was a "game changer" that would ensure American leadership and prosperity in the next century.

Authorities cancelled all flights and trains from Sanya, known as "China's Hawaii", on Saturday, a day after 263 positive cases were confirmed.

Travellers must now present five negative PCR tests over seven days before being allowed to leave.

China is the only major economy to still follow a "zero Covid" policy.

The country has recorded fewer than 15,000 deaths since the pandemic began, according to Johns Hopkins University. However, there have been concerns about the impact of the strict rules, including mass testing and local lockdowns, on the economy.

At a televised event with university students in the Tonga capital Nuku’alofa on Saturday, Sherman noted the countries had fought alongside each other since World War Two, some three decades before establishing formal relations.

She said while the countries shared values of religious freedom and concern for human rights, the U.S. also considered Tonga strategically important.