How young Somali immigrants searched for belonging, and found jihad. Second of a three-part series. Part I can be found here. Part III will appear next Friday.When 26-year-old Shirwa Ahmed, a Somali-born immigrant living in Minnesota, blew himself up in Puntland, Somalia, on Oct. 29 last year, he became the very first American suicide bomber, and a harbinger of a looming crisis. Ahmed sneaked into Somalia in late 2007, followed by potentially scores of other young Minnesotan Somali-Americans. ...