U.S.-backed forces in final push against Islamic State Raqqa

By John Davison and Rodi SaidRAQQA, Syria (Reuters) - U.S.-backed militias battled foreign fighters defending the last pocket of Islamic State's one-time Syrian capital of Raqqa on Monday, bringing their four-month offensive for the city to the brink of victory.A Reuters correspondent saw smoke rising above the city and heard mortar fire, but did not see air strikes while in Raqqa.A field commander of the Syrian Democratic Forces (SDF), an alliance of Kurdish and Arab militias, said he expected