US forces came under attack three times on Sunday evening, including near the Al Omar Oil field and at a US base at al-Shaddadi, the official told Reuters.
Multiple drones were fired at US forces at the Rumalyn Landing Zone on Monday morning, the official said. One drone was shot down but another damaged four tents, the official added.
The attacks came after the US carried out two air strikes on Sunday against facilities it said were used by Iran-aligned groups, its third set of strikes in Syria in as many weeks.
US and coalition troops have been attacked at least 40 times in Iraq and Syria since early October. Statements, purportedly from militant groups, have said the assaults are in response to US support for Israel in the war in Gaza. READ MORE