Syrian force urges Raqqa jihadists to surrender by end-May

A U.S.-backed alliance of Syrian militias promised on Thursday that no harm would come to Islamic State fighters in Raqqa who turned themselves in by the end of the month, calling on them to lay down their arms ahead of an expected assault on the city.The Syrian Democratic Forces, which groups Kurdish and Arab fighters, has advanced to within a few kilometers (miles) of Raqqa city at the nearest point, in an offensive that got underway in November to encircle and capture the city.The SDF, which