It was stored at a cement factory that served as a coordination center for the U.S.-led coalition and Kurdish forces in the fight against IS.

Two U.S. fighter jets launched airstrikes Wednesday to destroy ammunition that was left behind when American forces left a cement factory south of Kobani, Syria.

The factory had served as a coordination center for the U.S.-led coalition and Kurdish forces in the fight against the Islamic State group.

U.S. Army Col. Myles Caggins, a spokesman for the coalition, says the F-15E fighter jet strikes were pre-planned and destroyed ammunition stored at the Lafarge Cement Factory.

He says all coalition personnel and "essential tactical equipment" had left the base before the strike.