There is no evidence to suggest the substation fire that shut down Heathrow airport was suspicious, police say. The fire, which broke out in Hayes on Friday, resulted in the closure of Britain's busiest airport for a day. Police say the fire was no longer being treated as a "potentially criminal matter", following an investigation.

British police said a fire which caused Heathrow Airport to close for 18 hours last week was no longer being treated as a potentially criminal matter.Heathrow, Europe's busiest airport, shut on Friday after a fire at a nearby substation cut its power supply,

Around 200,000 passengers were disrupted after the airport was closed to all flights on Friday until around 6pm after the fire.

Heathrow executives are defending their response to a fire that shut down Europe’s busiest air hub for almost a day.

Heathrow’s chief executive has defended the airport’s response to the power outage and shutdown that sparked global travel chaos, apologizing to stranded passengers and confirming the airport is “operating as normal” Saturday.

Officials and travelers are calling for an investigation into not only how the blaze started, but how it was able to cause such a large disruption to global travel.