A 200lb unexploded World War II bomb was found in a quarry, police said.
The device was discovered close to Painters Road in Hainault, Essex, on Tuesday afternoon.
Officers put a cordon in place and the A12 was closed briefly to allow the Royal Engineers to reach the scene and defuse the bomb.
On Wednesday a Metropolitan Police spokesperson said there had been no evacuations and the incident had caused only minimal disruption.
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