Why it matters
The movement concerns U.S. military assets and force protection at a base in a close ally. The reports do not establish a direct threat to Americans or specify any effect on missions or operations.
What happens next
The aircraft have been dispersed from the base, and U.S. and British officials are coordinating, according to the reports. The supplied accounts do not say how long the heightened alert or relocation will last.
Whether officials provide details about the reported threat or its source.
Whether the aircraft return or the base alert level changes.