The FBI investigation into a group of Seattle-based militant Muslims has a bigger target, federal sources say: Abu Hamza al-Masri, the firebrand Islamic cleric in London who supports Osama bin Laden and whose mosque is considered a recruiting ground for the al-Qaida terrorist network. The investigation accelerated late Monday when federal agents in Denver arrested James Ujaama, 36, a central figure in the Seattle group. He is being held on a material-witness warrant issued by a federal grand jury in the Eastern District of Virginia, the Justice Department's hub for international terrorist investigations. Ujaama and others connected with a now-defunct...