WASHINGTON – Attorney General Eric Holder said Wednesday that the Justice Department will take appropriate action in the killing of Trayvon Martin if it finds evidence that a federal criminal civil rights crime has been committed. The attorney general made the comment in an appearance before a civil rights organization founded by the Rev. Al Sharpton. Holder says the department will conduct a thorough and independent review of the evidence in the Martin matter. The attorney general says one of the department’s top priorities is preventing and combating youth violence and victimization. The Justice Department launched an investigation of the killing three weeks ago. Holder told the 14th annual convention of the National Action Network that “many of you are greatly — and rightly — concerned” about the shooting death of the 17-year-old Martin. The attorney general says that Justice Department officials including Tom Perez, the assistant attorney general for the civil rights division, and U.S. Attorney Robert O’Neill from Florida have traveled to Sanford to meet with the Martin family, members of the community and local authorities. He says representatives from the department’s Community Relations Service are meeting with civil rights leaders, law enforcement officers and residents to address community tensions. Neighborhood watch volunteer George Zimmerman says he shot Martin in self-defense after following the teenager in a Sanford, Fla. a gated community outside Orlando on Feb. 26. He said he was returning to his truck when Martin attacked him and that he shot the unarmed teen during the fight. He wasn’t arrested partly because of Florida’s “stand your ground” self-defense law. The lack of an arrest has led to protests across the nation and spurred a debate about race and the laws of self-defense. Zimmerman’s father is white and his mother is Hispanic. Martin was black.