India, March 21 -- Heathrow Airport in Britain's London was closed all day on Friday, March 21, after a major fire at a nearby electrical substation knocked out its power, disrupting hundreds of flights at Europe's busiest travel hub.

According to flight tracking service FlightRadar 24, at least 1,350 flights to and from Heathrow were affected, and the impact was likely to last several days as passengers try to reschedule their travel.

Around 120 flights were airborne when the closure was announced, forcing some to turn back, while others were rerouted to alternative airports, including Gatwick near London, Charles de Gaulle in Paris, and Shannon in Ireland, as per flight tracking data.

Britain's Heathrow airport shut down early on Fri...