The attack happened near a location containing oil and gas fields known as Conoco, where US troops are deployed.
“I can confirm that there was an indirect fire attack in Conoco (Syria). At this time, initial reports are no casualties, injuries (or) structural damage,” the official said.
This is one of several locations in eastern Syria where US troops operate to help local partner forces fight against ISIS. There are a total of about 900 US troops in Syria.