The UK police declared a major incident at a Royal Air Force (RAF) base on Sunday morning, after several men were arrested near RAF Fairford on suspicion of explosive offences.
The base, located in south-west England, hosts U.S. military personnel and has historically been used as an American forward operating base. It is the USAF's only European airfield for heavy bombers; the facility has been used by U.S. strategic bombers during the Gulf War, the NATO bombing of Yugoslavia and the Iraq War.