Some US government employees from the US Embassy in Baghdad and its consulate in Erbil have been ordered to leave Iraq.
In a statement, the US State Department said: "Normal visa services at both posts will be temporarily suspended".
A US State Department spokesman said the decision to withdraw the staff was based on escalating tensions between Washington and Iran.
He, however, didn't give details on how many personnel were leaving.

Floods, landslides kill 56 in India and 14 in Nepal
British police arrest five men at US air base in major incident
Bill Gates joins calls for AI safeguards, including legislation
Russian attacks kill three in Ukrainian cities
South African police hunt suspects after 27 killed in two separate shootings