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Smoke shrouds the Sydney Harbour Bridge in Australia's most populous city on Thursday. Photo: Cassie Trotter/Getty Images

Smoke from Australia's deadly wildfires blanketed the state capitals of Sydney and Adelaide as air quality exceeded "hazardous" levels on Thursday, the BBC reports.

Why it matters: Thousands of people have fled the fires. Per News.com.au, much of the country is on high fire alert, as blazes rage across all six of Australia's states. Six people have died in the bushfires in the eastern states of Queensland and New South Wales.

A tweet previously embedded here has been deleted or was tweeted from an account that has been suspended or deleted.
Residents defend a property from a bushfire at Hillsville near Taree, north of Sydney. Photo: Peter Parks/AFP via Getty Images
A NSW Rural Fire Service firefighter mops up after a bushfire in the suburb of Llandilo in Sydney. Photo: Sam Mooy/Getty Images
Trees are burned black after a bushfire in Old Bar, north of Sydney. Photo: Peter Parks/AFP via Getty Images
Firefighters tackle a wildfire that's threatening a home in Taree, north of Sydney. Photo: Peter Parks/AFP via Getty Images
Fire burns near the small town of Deepwater, near Glen Innes in northern New South Wales. Photo: Brook Mitchell/Getty Images
A dehydrated and injured Koala receives treatment at the Port Macquarie Koala Hospital in Port Macquarie, Nov. 2. Photo: Saeed Khan/AFP via Getty Images
Wildfires burn in the distance as children play on a beach in Forster, north of Sydney, Nov. 9. Photo: Peter Parks/AFP via Getty Images
Australian Prime Minister Scott Morrison comforts 85-year-old Owen Whalan at an evacuation center in Taree, Nov. 10. Photo: Peter Parks/AFP via Getty Images
An aerial photo of the fires over northeastern New South Wales, Nov. 9. Photo: Tom Bannigan/AFP via Getty Images
The remains of a house destroyed by fire in Old Bar, north of Sydney, Nov. 10. Photo: Peter Parks/AFP via Getty Images
A fire rages in Bobin, north of Sydney, Nov. 9. Photo: Peter Parks/AFP via Getty Images

Editor's note: This article has been updated with new details throughout.

Go deeper

Updated 7 hours ago - World

Skripal poisoning suspects linked to Czech blast, as country expels 18 Russians

Combined images released by British police in 2018 of Alexander Petrov (L) and Ruslan Boshirov, who are suspected of carrying out an attack in the in the southern English city of Salisbury using Novichok, a military-grade nerve agent, and also the2014 Czech depot explosion. Photo: Metropolitan Police via Getty Images

Czech police on Saturday connected two Russian men suspected of carrying out a poisoning attack in Salisbury, England, with a deadly ammunition depot explosion southeast of the capital, Prague, per Reuters.

Driving the news: Czech officials announced Saturday they're expelling 18 Russian diplomats they accuse of being involved in the blast in Vrbětice, AP notes. Czech police said later they're searching for two men carrying several passports — including two with the names Alexander Petrov and Ruslan Boshirov.

Indianapolis mass shooting suspect legally bought 2 guns, police say

Marion County Forensic Services vehicles are parked at the site of a mass shooting at a FedEx facility in Indianapolis, Indiana, on Friday. Photo: Jeff Dean/AFP via Getty Images

The suspected gunman in this week's mass shooting at a FedEx facility in Indianapolis legally purchased two "assault rifles" believed to have been used in the attack, police said late Saturday.

Of note: The Indianapolis Metropolitan Police Department's statement that Brandon Scott Hole, 19, bought the rifles last July and September comes a day after the FBI told news outlets that a "shotgun was seized" from the suspect in March 2020 after his mother raised concerns about his mental health.

U.S. and China agree to take joint climate action

US Special Presidential Envoy for Climate John Kerry waves as he arrives at the Elysee Presidential Palace on March 10, 2021 in Paris. Photo: Chesnot/Getty Images

Despite an increasingly tense relationship, the U.S. and China agreed Saturday to work together to tackle global climate change, including by "raising ambition" for emissions cuts during the 2020s — a key goal of the Biden administration.

Why it matters: The joint communique released Saturday evening commits the world's two largest emitters of greenhouse gases to work together to keep the most ambitious temperature target contained in the Paris Climate Agreement viable by potentially taking additional emissions cuts prior to 2030.