Defence sources have told the that suspicion had fallen on a “state actor” being responsible for the incursions.
So far neither the US or UK authorities would be drawn on who might be responsible.
Defence minister Lord Coaker told the House of Lords on Thursday: “The Ministry of Defence is aware of these reports and working closely with the US visiting forces, Home Office police forces and other partners to respond to recent events.
“We take any safety issue seriously and maintain robust measures at Ministry of Defence sites. This includes counter-drone capabilities.”
The minister told Parliament: “It is illegal for drones to be flown or within the vicinity of these military sites and people should be aware of that.”
“This remains a live criminal investigation.”
Previously the Ministry of Defence, which owns the bases, said: “We take threats seriously and maintain robust measures at defence sites.”
The US Air Force in Europe said: “To date, installation leaders have determined that none of the incursions impacted base residents, facilities or assets.
“The Air Force is taking all appropriate measures to safeguard the aforementioned installations and their residents”.
