Unidentified drones have been spotted over U.S. bases in the U.K. used by American forces for a week, Fox News has confirmed.

The U.S. Air Force reported several incursions occurred in the past week at four bases where the American forces operate.

US officials are monitoring drone sightings near three bases in England. 60 British personnel are aiding the investigation.

The Air Force didn’t identify who was behind the incursions, but said officials determined there was no impact on residents or critical infrastructure.

The government has warned that those behind recent drone incursions over US airbases will be "shown the full force of the law". Defence Minister Maria Eagle said it was "taking steps" after the mystery unmanned aerial vehicles (UAVs) were spotted over and around the three locations in Suffolk and Norfolk.

The British military has increased security around four air bases in the country that are used by U.S. forces after "a number" of drones were spotted near them.

Unidentified drones have been spotted again over three British air bases used by the U.S. Air Force, officials confirmed Tuesday. The three bases are all located within the same area of eastern England between Cambridge and Norwich,

A UK government official said the country is “doing its best” to counter drone swarms over US bases, as US DoD states it is taking situation “seriously”.

Heightened Security Amid Drone Sightings US and British airbases have ramped up their security following reports of suspicious drone activity near key military installations. The Royal Air Force (RAF) deployed sixty highly trained electronic warfare specialists to US-British airbases in East Anglia,