FILE - In this July 27, 2017 file photo, a U.S.-backed Syrian Democratic Forces fighter runs in front of a damaged building as he crosses a street on the front line, in Raqqa, Syria. The Syrian Democratic Forces said in a statement Wednesday, Sept. 20, 2017, that the battle for the Islamic State group's de-facto capital, Raqqa, has reached its "final stages" with the opening of a new front. (AP Photo/Hussein Malla, File)
The Associated Press
FILE - In this July 27, 2017 file photo, a U.S.-backed Syrian Democratic Forces fighter, runs as he fires mortars at Islamic State group militant, in Raqqa, northeast Syria. The Syrian Democratic Forces said in a statement Wednesday, Sept. 20, 2017, that the battle for the Islamic State group's de-facto capital, Raqqa, has reached its "final stages" with the opening of a new front. (AP Photo/Hussein Malla, File)
The Associated Press