Dozens of German soldiers had been relocated away from the base in Erbil, capital of Iraq's autonomous Kurdistan region.

"Only the personnel necessary to maintain the operational capability of the camp in Erbil remain on site," the spokesman said.

The spokesman did not specify the source of the tensions, but US President Donald Trump has ordered a major build-up of US warships, aircraft and other weaponry in the region and threatened action against Iran.

German troops are deployed to Erbil as part of an international mission to train local Iraqi forces.

The spokesman said the German redeployment away from Erbil was "closely coordinated with our multinational partners".