British counterterrorism investigators are examining whether five men arrested near RAF Fairford may have acted knowingly or unknowingly on behalf of a foreign state. The suspects remain under investigation. British authorities have made no attribution to Iran, and Tehran has denied involvement. RAF Fairford remains operationally significant because it hosts US heavy bombers and has supported operations against Iran.
Source: UK Counter Terrorism Policing, corroborating international reporting and Iranian diplomatic statements.