WASHINGTON, Sept. 14 — Five Arab-American men charged today with operating an active Al Qaeda terrorist cell in western New York received weapons training in Afghanistan in the summer of 2001 and had been sent back to the United States to await the order for an attack on American targets, federal law enforcement officials said today. The five suspects, all of them born in the United States and of Yemeni descent, were arraigned today in Buffalo on federal charges of providing "material support" to terrorists. They were arrested on Friday night in raids on their homes and businesses in Lackawanna,...