"The missile attack was carried out on the US base at the Al-Omar oil field, the sounds of explosions were heard inside the US base," the source said.
According to the source, after the shelling, smoke and flames rose in the area of the Al-Omar field, while the US military conducted reconnaissance from aircraft over the field and its environs.
There were no reports of injuries or casualties among US soldiers living on the base.
A late Sunday release issued by US Central Command confirmed the incident, and detailed that the rocket attack took place at approximately 7:05 p.m. local time. The strike "failed to strike US or Coalition forces, or equipment."
"Three 107mm rockets targeted the base. A fourth rocket along with rocket tubes was found at the launch point, approximately 5 kilometers away," reads the statement. "US forces in northeast Syria are investigating the incident."
According to Syrian media reports, a similar attack was conducted on the US base a few days ago.