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Hospitals are overwhelmed in the Indian capital, with the majority of intensive care beds occupied.
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The White House says the US will curb emissions by 50-52%, as leaders gather for virtual summit.
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Russia's opposition leader could die, warn the doctors who had treated him before he was jailed.
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Israeli police fire tear gas, trying to keep apart rival groups of Jewish activists and Palestinians.
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But seven others seized earlier in April remain in captivity, with a gang demanding $1m in ransom.
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A Model Y made multiple trips on a test track without a human in the driver's seat, engineers found.
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A study found no mutations associated with a parent's exposure in the 1986 nuclear accident.
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The death of Daunte Wright, who was shot near Minneapolis earlier this month, sparked mass protests.
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Akayed Ullah detonated a bomb in Times Square station during rush hour in December 2017.
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The cancellation comes just three months before the Tokyo Olympics is due to go ahead.