An American military refueling aircraft crashed Thursday in western Iraq while supporting U.S. operations in the region, according to officials with United States Central Command.

The aircraft involved was a Boeing KC-135 Stratotanker, a refueling plane used to extend the range of U.S. military aircraft during combat and surveillance missions. Officials said two tanker aircraft were involved in the incident, with one landing safely while the other went down during the mission.

Central Command said the aircraft was participating in operations connected to the ongoing conflict involving Iran, but emphasized that the crash was not the result of hostile or friendly fire.

“More information will be made available as the situation develops,” Central Command said in a statement, adding that officials are working to gather additional details before providing further updates. The command also asked for patience as authorities seek to clarify the situation for the families of the service members involved.

Search and rescue operations were underway following the crash. It was not immediately clear whether there were casualties. A KC-135 tanker typically carries a crew of three service members.

The incident marks the fourth publicly acknowledged aircraft loss tied to U.S. military operations connected to the conflict with Iran.

Earlier in the week, three American fighter jets were accidentally shot down by Kuwaiti defensive fire during regional operations, according to officials.

The Pentagon has said that since the fighting began, seven American service members have been killed and roughly 140 others wounded during the conflict. Military officials have not yet released further details about the circumstances surrounding Thursday’s crash or the condition of the crew.