Alarmed by resurgent anti-Muslim rhetoric in the aftermath of the beheading of an American in Iraq, U.S. Muslim leaders launched a new campaign Thursday to disassociate their faith from terrorism. In Washington, the Council on American-Islamic Relations called on the nation’s Muslims to sign an online petition to declare that terrorism betrays Islam and that American Muslims abhor it.In Los Angeles, Muslim leaders said that the beheading of American businessman Nicholas Berg would be condemned in as many as 50 mosques that are part of the Shura Council of Southern California. Berg was killed by a man identified Thursday by the CIA as Abu Musab Zarqawi, who is considered an ally of Osama bin Laden. Full Story