Two rockets targeted the international coalition led by the US at the Conoco support site in northeast Syria on Wednesday, according to US CENTCOM.
No injuries or damage were reported in the attack. A third unfired rocket was found nearby.
"Attacks of this kind place coalition forces and the civilian populace at risk and undermine the hard-earned stability and security of Syria and the region," said Col. Joe Buccino, the spokesman for CENTCOM.