German police say 26-year-old man has turned himself in, claiming to be behind Solingen knife attack  The Associated PressGerman stabbing suspect is 26-year-old Syrian man who admitted to the crime  ReutersSyrian suspect in Solingen attack faced deportation order  Yahoo! VoicesIslamic State claims responsibility in German festival attack as second suspect arrested  Fox NewsGerman feds take over festival stabbing case, citing suspected terrorism  The Washington Post