Gavin Grey: UK correspondent on London police revealing the Heathrow Airport fire was not a criminal issue - Heather du Plessis-Allan Drive

An electricity substation fire in London that closed Heathrow Airport last week is no longer being treated as a criminal matter.

Metropolitan Police have announced there's no evidence to suggest it's suspicious - after briefly bringing in counter-terrorism officers.

UK correspondent Gavin Grey unpacks the findings of the investigation.

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