Russian jets bombed a target east of the Euphrates River near Dayr Az Zawr in Syria where it knew U.S.-backed Syrian Democratic Forces and coalition advisers were located, the Pentagon said on Saturday, as cited by Reuters.

The Pentagon said that Russian forces bombed a target in eastern Syria, a location known to Russians to contain U.S.-backed forces fighting the Islamic State group.

“At approximately 12:30 a.m. GMT Sept. 16, Russian forces struck a target east of the Euphrates River in Syria near Dayr Az Zawr, causing injuries to Coalition partner forces,” the U.S.-led coalition said in a statement.

“Russian munitions impacted a location known to the Russians to contain Syrian Democratic Forces and Coalition advisors. Several SDF fighters were wounded,” the statement added.