this is bbc news — welcome if you're watching here in the uk or around the globe. i'm christian fraser. our top stories at least 60 people have been killed in winter storms across the united states and canada. president biden has approved emergency federal help for new york state, as the arctic freeze continues. police name the victim of a stabbing on the dance floor of a nightclub in birmingham as 23—year—old cody fisher serbia has put troops on high alert over rising tensions with kosovo. taiwan says all men will now be required to serve one year's military service — after china launches one of its biggest incursions into taiwanese airspace. here in the uk, two people are being questioned in connection with the fatal shooting of a young woman in merseyside on christmas eve.