Russian and Syrian forces “accidentally” bombed U.S.-backed fighters in Syria on Tuesday, killing some Syrian rebels, a top U.S. general said Wednesday.

A joint operation targeting Islamic State (ISIS) militants near the village of al-Bab sent missiles at Syrian coalition troops instead, according to Army Lt. Gen. Stephen Townsend.

“Yesterday, we had some Russian aircraft and regime aircraft bomb some villages that I believe they thought were held by ISIS,” Townsend said. “Yet, they were actually—on the ground were some of our Syrian Arab Coalition forces.”

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