More omicron cases pop up as world rushes to learn more

  • People wear face masks Sunday as they walk on Regent Street, in London. (AP Photo/Alberto Pezzali)

THE HAGUE, Netherlands — 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.