Defence bosses have confirmed that a US fighter jet came within a few hundred feet of the former Berkeley nuclear power station in Gloucestershire.
The Ministry of Defence also confirmed two breaches by RAF helicopters of the anti-terrorist no-fly zone around the decommissioned plant.
The MoD said the three incidents since the September 11 attacks had been accidental.
There had been no risk to people or property, the MoD said.
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