London's main airport, a major gateway for American travelers to Europe, expects disruption for days as a result of a fire at an electrical substation. At least 1,300 flights were affected.

"To maintain the safety of our passengers and colleagues, Heathrow will be closed until 23h59 on 21 March." Travelers were warned to stay away from the airport and to contact their airline for further information.

One of the world’s busiest airports will be shut down all day Friday due to a fire at a substation that supplies it with power.