The five men, aged 23 to 25, remain under investigation and are subject to strict bail conditions. Police have not confirmed whether they were acting on behalf of a foreign state.

The arrests followed a security operation involving three suspicious vehicles near the air base, which has been used by U.S. military aircraft. Authorities evacuated dozens of nearby households while bomb-disposal specialists examined the vehicles.

British officials stressed that the men’s release on bail does not mean they have been cleared of wrongdoing.