UK authorities raise security at a British airbase used by the United States after monitoring increased threats, before an attempted attack is foiled, according to people familiar with the matter.

Multiple Bloomberg reports describe the same sequence: UK officials are closely monitoring the heightened threat environment and tighten security at the base ahead of an incident on Sunday. The base is used by the US as part of operations that include air strikes against Iran. The reporting cites unnamed sources familiar with the matter, and does not provide further operational details about the alleged plot or the specific security measures taken beyond the fact that they were increased in advance.