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Jun 1: Gold prices rose on Monday as riots in major U.S. cities rattled investors already reeling from strained Sino-U.S. relations and boosted demand for the safe-haven metal, with a weaker dollar lending further support.

Spot gold gained 0.8% to $1,739.75 per ounce by 0242 GMT. U.S. gold futures ticked up 0.1% to $1,752.60.

"Concerns about the unrest in the United States at the moment appear to be weighing on market sentiment," said Michael McCarthy, chief strategist at CMC Markets, adding that rising tensions between the world's top two economies provided further support to gold.

Protesters have flooded the streets in the United States over the death of George Floyd in police custody, in a wave of outrage sweeping a politically and racially divided nation.

The closely packed crowds and demonstrators not wearing masks have sparked fears of a resurgence of COVID-19, which has killed more than 101,000 Americans.

In Asia, China's state media and the government of Hong Kong lashed out on Sunday at U.S. President Donald Trump's pledge to end Hong Kong's special status if Beijing imposes new national security laws on the city.

Gold is often used as a safe store of value during times of political and financial uncertainty.

Indicative of sentiment, holdings of SPDR Gold Trust, the world's largest gold-backed exchange-traded fund, rose 0.3% to 1,123.14 tonnes on Friday, a fresh seven-year high.

Further supporting gold's appeal, the dollar index fell 0.4% against its rivals.

Elsewhere, silver jumped 2% to $18.20 per ounce, its highest since Feb. 26, before retreating slightly to trade 1.8% higher at $18.16.

Speculators cut their bullish positions in COMEX gold and increased them in silver contracts in the week to May 26, the U.S. Commodity Futures Trading Commission said on Friday.

Palladium rose 0.7% to $1,958.25 per ounce, while platinum declined 0.3% to $835.56.

Jun 13: Requiring the wearing of masks to prevent the spread of the novel coronavirus in areas at the epicenter of the global pandemic may have prevented tens of thousands of infections, a new study suggests.

Mask-wearing is even more important for preventing the virus' spread and the sometimes deadly COVID-19 illness it causes than social distancing and stay-at-home orders, researchers said, in the study published in PNAS: The Proceedings of the National Academy of Sciences of the USA.

Infection trends shifted dramatically when mask-wearing rules were implemented on April 6 in northern Italy and April 17 in New York City - at the time among the hardest hit areas of the world by the health crisis - the study found.

"This protective measure alone significantly reduced the number of infections, that is, by over 78,000 in Italy from April 6 to May 9 and over 66,000 in New York City from April 17 to May 9," researchers calculated.

When mask-wearing went into effect in New York, the daily new infection rate fell by about 3% per day, researchers said. In the rest of the country, daily new infections continued to increase.

Direct contact precautions - social distancing, quarantine and isolation, and hand sanitizing - were all in place before mask-wearing rules went into effect in Italy and New York City. But they only help minimize virus transmission by direct contact, while face covering helps prevent airborne transmission, the researchers say.

"The unique function of face covering to block atomization and inhalation of virus-bearing aerosols accounts for the significantly reduced infections," they said. That would indicate "that airborne transmission of COVID-19 represents the dominant route for infection."

The U.S. Center for Disease Control and Prevention on Friday urged organizers of large gatherings that involve "shouting, chanting or singing to strongly encourage the use of cloth face coverings to lower the risk of spreading the coronavirus."