LOS ANGELES >> The massive protests sweeping across U.S. cities following the police killing of a black man in Minnesota have sent shudders through the health community and elevated fears that the huge crowds will lead to a new surge in cases of the coronavirus.

Some leaders appealing for calm in places where crowds smashed storefronts and destroyed police cars in recent nights have been handing out masks and warning demonstrators they were putting themselves at risk.

“If you were out protesting last night, you probably need to go get a COVID test this week,” Atlanta Mayor Keisha Lance Bottoms said this evening. “There is still a pandemic in America that’s killing black and brown people at higher numbers.”

Minnesota’s governor said too many protesters weren’t socially distancing or wearing masks after heeding the call earlier in the week.

But many seemed undeterred.

“It’s not OK that in the middle of a pandemic we have to be out here risking our lives,” Spence Ingram said Friday after marching with other protesters to the state Capitol in Atlanta. “But I have to protest for my life and fight for my life all the time.”

Ingram, 25, who was wearing a mask, said she has asthma and was worried about contracting the virus. But she said as a black woman, she always felt that her life was under threat from police and she needed to protest that.

The demonstrations over the killing of George Floyd, a black man who died after a white Minneapolis officer pressed a knee into his neck, are coming at a time when many cities were beginning to relax stay-at-home orders.

That’s especially worrisome for health experts who fear that silent carriers of the virus who have no symptoms could unwittingly infect others at gatherings with people packed cheek to jowl and cheering and jeering without masks.

“Whether they’re fired up or not that doesn’t prevent them from getting the virus,” said Bradley Pollock, chairman of the Department of Public Health Sciences at the University of California, Davis.

Even for the many protesters who have been wearing masks, those don’t guarantee protection from the coronavirus. The Centers for Disease Control and Prevention recommends cloth masks because they can make it more difficult for infected people to spread the virus — but they are not designed to protect the person wearing the mask from getting it.

The U.S. has been worst hit by the coronavirus outbreak, with more than 1.7 million cases and over 103,000 deaths, according to a tally kept by Johns Hopkins University.

In New York, where more than 21,000 people have died during the pandemic, a large crowd in Brooklyn tossed water bottles at officers and torched a police van Friday outside the Barclays Center. Officers cleared the crowd by spraying an eye-irritating chemical.

Minnesota Gov. Tim Walz said after another night of unrest in Minneapolis that many protesters wearing masks were simply trying to hide their identities and “cause confusion and take advantage of this situation.”

“I will continue to stress, because it seems like a lifetime ago: We are still in the middle of a pandemic and passed 1,000 deaths yesterday. We still have hospitals on the verge of being overrun with COVID-19,” he said.

Minneapolis Mayor Jacob Frey echoed those concerns: “We have two crises that are sandwiched on top of one other.”

The state’s health commissioner had warned just days earlier that the massive protests were almost certain to fuel new cases of the virus. Minnesota reported 35 deaths on Thursday, a single-day high since the start of the outbreak, and 29 more on Friday.

But it wasn’t just protesters at risk — unmasked officers stood within arm’s reach of shouting demonstrators. In Atlanta, police Chief Erika Shields waded into a crowd without a mask Friday while she listened to people air frustrations.

When Los Angeles officials announced earlier in the week that the city was relaxing stay-at-home orders and reopening stores, they said political protests could resume but with a cap of 100 people.

Several hundred people showed up for a protest organized by Black Lives Matter-LA and later shut down a freeway. Most wore masks, but many did not observe a buffer zone.

Los Angeles County Public Health Director Barbara Ferrer said Friday that was an ongoing concern.

“Show respect for each other by putting on that face covering so that your respiratory droplets aren’t unintentionally getting into somebody else’s mouth, nose or eyes,” she said.

Those same concerns surfaced today in Paris when unions flouted a ban on large gatherings at a march to protest conditions for workers in the country illegally. Police used tear gas to disperse the crowds and said they had banned the march due to the “health risks that such an event is likely to generate.”

Meanwhile, the European Union today urged President Donald Trump to rethink his decision to terminate the U.S. relationship with the World Health Organization as spiking infection rates in India and elsewhere reinforced that the pandemic is far from contained.

Trump on Friday charged that the WHO didn’t respond adequately to the pandemic and accused the U.N. agency of being under China’s “total control.” The U.S. is the largest source of financial support for the WHO, and its exit is expected to significantly weaken the organization.

The head of the EU’s executive arm urged Trump to reconsider. “The WHO needs to continue being able to lead the international response to pandemics, current and future,” European Commission President Ursula von der Leyen said.

German Foreign Minister Heiko Maas told Germany’s Funke media group that Trump’s decision was the “wrong signal at the wrong time.”

In China, where the virus outbreak began, only four new confirmed cases were reported today, all brought from outside the country.

More than 6 million coronavirus infections have been reported worldwide, with over 368,000 deaths and more than 2.5 million recoveries, according to the Johns Hopkins tally. The true death toll is widely believed to be significantly higher, with experts saying many victims died of the virus without ever being tested for it.

Elite sporting events will be allowed to resume in England starting Monday, but without spectators, paving the way for the planned June 17 return of the Premier League, the world’s richest soccer competition.

England’s deputy chief medical officer Jonathan Van-Tam warned that the situation overall remained precarious. “I believe this is also a very dangerous moment,” he said. “We have to get this right.”

India registered another record single-day jump of 7,964 cases and 265 deaths. The government had been expected to end a 2-month-old nationwide lockdown but instead extended measures in some areas due to coronavirus outbreaks.

Italy, though, added 111 new victims to its death toll and nearly 420 new infections, in line with its recent daily tallies, suggesting the virus is under control nearly four weeks after the country began gingerly loosening a strict lockdown in the onetime European epicenter of the pandemic.