WASHINGTON (Reuters) - The United States military has found enough credible information to begin a formal investigation into allegations that U.S.-led coalition air strikes killed civilians on July 20 in Syria, a spokesman for the coalition fighting Islamic State, Colonel Chris Garver, said on Wednesday.

Garver said a credibility assessment had been completed and the formal investigation had been initiated.

(Reporting by Idrees Ali and Yeganeh Torbati)