Mass flight cancellations affected London's Heathrow Airport (LHR) after it closed due to a fire at a nearby power station. The airport will remained closed most of Friday.

Britain's Heathrow Airport said on Friday that it had begun reopening after a massive fire at a nearby electrical substation knocked out power, forcing a shutdown at Europe's busiest airport and disrupting the flight schedules of airlines globally.

Heathrow is coming under growing scrutiny over its decision to close for nearly 24 hours following a fire at a nearby electrical substation, even though it was still able to receive power from other parts of the grid.