Hundreds of thousands of passengers faced flight cancelations at Europe's busiest travel hub after a fire knocked out power to London's Heathrow Airport and forced it to be closed for the day. At least 1,

It’s closed until midnight Friday due to an early morning fire at an electrical substation in West London that powers the European continent’s busiest airport. Passengers have been told not to travel to the airport “under any circumstances” with “significant disruption” expected over the next few days.