Already a subscriber? Make sure to log into your account before viewing this content. You can access your account by hitting the “login” button on the top right corner. Still unable to see the content after signing in? Make sure your card on file is up-to-date.

The US military evacuated aircraft from RAF Mildenhall in eastern England on Monday after another reported threat from Iran.

Getting into it: First reported by the Wall Street Journal citing people familiar with the matter, two US refueling tankers based at Mildenhall were diverted to Germany early Monday, and several more left for Germany and elsewhere as the day went on. It’s not known how specific Iran’s threat was, and US officials are still discussing its exact nature. The US also raised the security level at Mildenhall and nearby RAF Lakenheath to Force Protection Condition Charlie, the second-highest level, which kicks in when intelligence points to a likely terrorist attack.

Top congressional leaders, known as the “Gang of Eight,” were briefed on Iranian threats Monday, and Secretary of State Marco Rubio said the US was handling it by getting people out of the threat’s way. A US Air Force spokesperson declined to discuss the moves but said aircraft rotate between bases for many reasons. Mildenhall hosts Europe’s only permanent US air refueling wing and is used by US presidents when flying into the UK.

When asked for comment, the UK Ministry of Defense said, “We do not routinely comment on the activity of other nations. Aircraft and other assets move regularly according to operational requirements.”

The move follows a September incident at RAF Fairford, the base the US used to launch bombing runs on Iran, where five men were arrested outside. This led to the US pulling strategic bombers from the facility. British prosecutors have since charged two men under the National Security Act, and Prime Minister Andy Burnham said Iran was likely behind what happened at Fairford.

Tehran has denied involvement, though Iran’s Revolutionary Guard has said it considers any base used to strike Iran fair game.

This all comes as the US weighs whether to resume strikes on Iran, with Supreme Leader Mojtaba Khamenei warning Iran’s response to any new attack would have “no geographical limits.”