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Spectators attend a rock music concert by Spanish group Love of Lesbian at the Palau Sant Jordi in Barcelona, Spain, on Saturday, with face masks required but no social distancing needed. Photo: Lluis Gene/AFP via Getty Images

5,000 masked music fans packed into the Palau Sant Jordi arena in Barcelona, Spain, Saturday for a rock concert with no social distancing, as part of a study into the effectiveness of same-day COVID screenings.

Why it matters: Organizers say Spanish rock group Love of Lesbian's concert is the "first commercial event of this size held in Europe during the pandemic," AP notes. The event is an exception to Spain's four-person limits on gatherings in enclosed spaces, per Euronews.

Health workers collect swab samples for Rapid Antigen Test for COVID-19 ahead of the concert. "People with heart disease, cancer, or those who have been in contact with someone infected by COVID-19 in recent weeks were asked not to sign up," AP reports. Photo: Lluis Gene/AFP via Getty Images
The scene before the concert's start. A smaller study was held in Barcelona last December, with 500 people attending the concert. Preliminary results indicate the combination of wearing masks and pre-screening with antigen tests works in preventing the virus spread despite the absence of distancing rules, per Euronews. Photo: Lluis Gene/AFP via Getty Images
Spectators soak in the atmosphere. "After two months of a downward trend," from the third wave of the pandemic, case numbers have risen again this past week, El País reports. Photo: Lluis Gene/AFP via Getty Images
Santi Balmes of Love of Lesbian addresses the audience during the concert. Photo: Xavi Torrent/Getty Images

Go deeper

In photos: Deadly tornadoes leave path of destruction across the South

The aftermath of the tornadoes in Ohatchee, Alabama. Photo: Julie Bennett via Getty Images

A major outbreak of high-end, "violent" tornadoes and severe storms ripped through the South on Thursday, leaving behind debris and destruction.

The big picture: At least six people were killed. Severe weather in this region can be especially deadly due to the housing types that are prevalent here, including large numbers of mobile homes, Axios' Andrew Freedman writes.

Super typhoon Surigae explodes to Cat. 5 intensity

Super Typhoon Surigae seen on satellite imagery Saturday morning east of the Philippines. (CIRA/RAMMB)

Super Typhoon Surigae surged in intensity from a Category 1 storm on Friday to a beastly Category 5 monster on Saturday, with maximum sustained winds estimated at 190 mph with higher gusts.

Why it matters: This storm — known as Typhoon Bising in the Philippines — is just the latest of many tropical cyclones to undergo a process known as rapid intensification, a feat that studies show is becoming more common due to climate change. It weakened slightly, to the equivalent of a strong Category 4 storm, on Sunday.

4 hours ago - World

Biden adviser warns "there will be consequences" for Russia if Navalny dies

The Biden administration warned the Russian government "that there will be consequences" if jailed Russian opposition leader Alexei Navalny dies, National Security Adviser Jake Sullivan told CNN on Sunday.

The big picture: Sullivan also defended President Biden for not mentioning Navalny in a Thursday speech about Russia or in a Tuesday call with Russian President Vladimir Putin, saying the White House aims to deal with the issue "privately and through diplomatic channels."