The United States has relocated military aircraft from another airbase in the United Kingdom following reports of a potential security threat linked to Iran, raising fresh concerns over the safety of American military assets stationed across Europe.

According to media reports, several US military aircraft were moved from RAF Mildenhall in eastern England on Monday. The development marks the second reported withdrawal of American military aircraft from a British airbase in recent months.

Flight-tracking information indicated that at least 10 US KC-135 Stratotanker aerial refuelling aircraft departed from RAF Mildenhall. The aircraft were reportedly transferred to different locations, including Germany, Spain and Scotland. Several Osprey military aircraft also left the installation and moved to nearby RAF Lakenheath.

The reported relocation followed concerns about a possible threat from Iran, according to a report by The Wall Street Journal, which cited people familiar with the matter. However, the exact nature and seriousness of the reported threat have not been publicly established.

US military officials have not provided specific details about the aircraft movements. The US Air Force has maintained that military aircraft regularly move between different installations for operational requirements, training activities and other purposes.

The development has also drawn attention to security arrangements at RAF Mildenhall and RAF Lakenheath. Reports indicated that security measures at both locations had been raised to Force Protection Condition Charlie, one of the higher alert levels used by the US military.

British authorities, meanwhile, have sought to reassure the public about the safety of military installations in the country. The UK government said protecting military bases remains a priority and that security arrangements are regularly reviewed in coordination with international partners.

The latest aircraft relocation comes weeks after the United States moved its B-1 bombers away from RAF Fairford following a separate security incident involving suspected Iranian-linked activity. British authorities subsequently brought charges against two individuals in connection with that investigation.

The repeated movement of American military aircraft from British installations highlights the security challenges facing US forces operating overseas amid continuing tensions involving Washington and Tehran.

RAF Mildenhall is an important American military installation in Europe and hosts the US Air Force’s 100th Air Refueling Wing. Its KC-135 aircraft play a significant role in extending the operational range of military aircraft by providing fuel during flight.

For now, neither Washington nor London has publicly confirmed all the details surrounding the latest relocation. The movement appears to be a precautionary security measure, although further information about the reported threat remains limited.

The situation is being closely watched as developments in US-Iran relations continue to influence military security arrangements across the Middle East and Europe.