A suspected Iranian drone hit a US diplomatic facility in Iraq Tuesday, two sources familiar with the matter told CNN.

The drone struck the Baghdad Diplomatic Support Center — a large logistical and operational support hub located near the Baghdad airport. The drone hit near a guard tower, one of the sources said. It was unclear if there were any casualties. The extent of the damage is also not clear.

The strike comes as Iran has targeted US military and diplomatic installations as it retaliates for ongoing US and Israeli military operations. It underscores the continued threat to US personnel in the region.

CNN has reached out to the State Department for comment. The Washington Post first reported on the strike.

The State Department last week ordered non-emergency personnel to leave Iraq.

In a security alert Tuesday, the US Embassy in Baghdad urged American citizens “to exercise caution, avoid drawing attention, and stay away from areas that could make them a target.”

“Gathering in areas associated with the United States or with groups of other American citizens may put you at risk. Attacks against American citizens and interests in Iraq have occurred, Americans face a risk of kidnapping, and American companies, hotels frequented by foreigners, and other facilities in Iraq, including those with ties to the United States, have been targeted in attacks. Critical sites throughout Iraq have also been targeted in attacks,” the alert said.