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.

Bahrain detroys 95 missiles, 164 drones since start of Iranian attacks
Qatar Airways to run limited flights to Doha as airspace closure continues
Three injuries and material damage to a university building in Bahrain
Iranian President says remarks 'misinterpreted' as Gulf strikes continue
Explosion hits US embassy in Oslo, causing minor damage, thick smoke
