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.
Counter-terrorism officers were briefly drafted in to investigate. However, the Metropolitan Police said on Tuesday that the incident was no longer being treated as a “potentially criminal matter”.
Officers continue to support the London Fire Brigade, the National Grid and “other partners” to investigate the cause of the blaze.
