Originally posted by the Voice of America. Voice of America content is produced by the Voice of America, a United States federal government-sponsored entity, and is in the public domain. Concerns Persist About Fate of Captured Islamic State Jeff Seldin WASHINGTON - Fears that Turkey's offensive in northeastern Syria allowed untold numbers of captured Islamic State terror group fighters to escape may be overblown, according to U.S. officials. Since Turkish-backed forces crossed the border and began clashing with Kurdish fighters aligned with the U.S.-backed Syrian Democratic Forces (SDF), there have been reports of SDF-run prisons coming under attack and of IS fighters running free. .