Police closed roads and evacuated homes as they carried out a controlled explosion outside the North Korean embassy in west London.
Officers were called to a “suspicious item” shortly before 8pm outside the semi-detached house in Ealing, Scotland Yard said.
They destroyed the item, which was discovered in Gunnserbury Avenue, at about 9.30pm and confirmed that it was found to be non-suspicious.
A Metropolitan Police spokeswoman said: “Road closures were put in place and nearby properties were evacuated as a precaution.
“A controlled explosion took place at around 21:28 hours. The item was found to be non-suspicious.”
Roads have since been reopened.
The North Korean embassy is in a seven-bedroom residential house on the street.