The FBI, the Justice Department's Civil Rights Division, and the U.S. Attorney's Office for the Middle District of Florida will investigate the killing of Trayvon Martin, an unarmed 17-year-old Florida high school student, who was shot by a self-appointed neighborhood watchman. "The department will conduct a thorough and independent review of all of the evidence and take appropriate action at the conclusion of the investigation," a statement released by the Justice Department this evening said....