U.K. on Edge Heading Into Christmas Overshadowed by Omicron

Boris Johnson has given Britons the Christmas he has long promised -- some light-touch pandemic restrictions but with no limits on family gatherings. The big question is over what comes next. When the U.K. prime minister ruled out tighter restrictions in the coming days, he also urged Britons to be cautious and warned tougher curbs may yet be needed after Dec. 25 if an omicron-fueled wave of Covid-19 infections threatens to overwhelm the National Health Service.