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 the substation fire which caused Heathrow Airport to shut down for 18 hours last week was no longer being treated as a potentially criminal matter after inquiries found no evidence to suggest the incident was suspicious.