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More omicron cases pop up as world rushes to learn more

Cases of the omicron variant of the coronavirus popped up in countries on opposite sides of the world Sunday and many governments rushed to close their borders even as scientists cautioned that it's not clear if the new variant is more alarming than other versions of the virus.

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What we know and don't know about Omicron variant

The World Health Organization says it could still take some time to get a full picture of the threat posed by Omicron, a new variant of the coronavirus as scientists worldwide scramble to assess its multiple mutations. Here's a look at we we know about the variant and why scientists are worried.

Passengers arrive at Heathrow Airport in London, Monday, Nov. 29, 2021. (AP Photo/Frank Augstein)