London's Heathrow Airport reopened on Saturday after a power outage at one of the world's busiest airports the previous day caused widespread chaos and cancellations.

More than 1,300 flights were affected after a fire at a nearby electrical substation. Hundreds of thousands of passengers were stranded around the world.

London's Heathrow Airport, one of the busiest in the world, closed on Friday due to a "significant power outage," it said. The airport said in a statement early Friday that it would be closed until 11:59 p.