A failed rocket strike was launched at a base housing U.S.-led coalition forces at Rumalyn, Syria, marking the first time since Feb. 4 that Iranian-backed militias have attacked a U.S. facility in Iraq or Syria, a U.S. defense official said. No personnel were injured in the attack.

Iraqi authorities said early Monday that they were searching for “outlaw elements†who launched an estimated five missiles across the border from Iraq into Syria late Sunday night targeting the base. No group has claimed responsibility for the attack.

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