Five alleged backers of al-Qaeda have been extradited to the United States from Britain after long-running legal battles. Muslim cleric Abu Hamza al-Masri and four others arrived on Saturday after the European Court of Human Rights rejected their appeals. Al-Masri spent years in prison in Britain on a conviction of inciting racial hatred and soliciting murder. A federal grand jury indicted him in 2004 on allegations of supporting al-Qaeda and aiding a fatal kidnapping in Yemen. His lawyers had appealed his extradition to the United States by citing European statutes barring inhumane and degrading treatment. Two others were arrested after the 1998 U.S. embassy bombings in North Africa and had fought extradition since. The other two have been indicted on charges of supplying material to Islamic militants in Chechnya and to the Taliban. One of those two, Babar Ahmad, is a British citizen. His supporters had waged a long campaign criticizing the U.S.-Britain extradition treaty and calling for him to be tried on British soil.