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.
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Flights at major British airports were disrupted on Tuesday by a technical fault at air traffic control provider NATS, the latest in a series of failures that renewed questions about the resilience of Britain's aviation infrastructure.
At least 73 injured after Houthi rebels attack Saudi civilian and energy facilities
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UK, France and Canada sanction Israeli West Bank settlements
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Suspect detained after sabotage attacks on Germany power grid
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Nepal rescue focused on workers trapped in three tunnels
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