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    At least 3 dead, 3 critically injured in Copenhagen mall shooting

    00:48
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  • WNBA star Brittney Griner on trial in Moscow today

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  • Ukrainian prisoners of war detail life under Russian control

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  • Gay couples in Switzerland marry after same-sex unions legalized

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  • Ukraine blames Russia for deadly missile strike on residential area in Odesa region

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  • China's Xi swears-in new Hong Kong leader as territory marks 25 years since British handover

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  • NASA scientists test technology that could help sustain life on the moon

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  • Early human fossils found in South African cave dated one million years older than suspected

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  • New Zealand designates Proud Boys as terrorist group

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  • 'Napalm Girl' from iconic Vietnam photo receives final burn treatment

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  • Ukrainian troops in U.K. receive training in multiple launch rocket systems

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  • Ferdinand Marcos Jr. sworn in as Philippines new president

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World awaits Iran president’s UN debut

02:32

President Hassan Rouhani arrived in the US Monday on his first trip to address the UN. Both he and President Obama will be speaking at the UN on Tuesday but it’s still unknown as to whether the two leaders will meet. NBC’s Andrea Mitchell reports.