BENGALURU, March 21 — Britain's Heathrow Airport said it would be closed all of today after a huge fire at a nearby electrical substation wiped out power, disrupting flight schedules around the world.

WASHINGTON, Dec 28 — Nearly 3,000 flights have been cancelled and more than 12,000 have been delayed globally on Monday over concerns among airlines about the coronavirus Omicron variant, according to the tracking website Flightradar24, Sputnik reported.