TRIPOLI, Lebanon - The militants began trickling into the camp about 10 months ago, distinguished by their beards, combat uniforms and the assault rifles they carried openly. They rarely smiled and spoke only to rebuke camp residents for smoking or other perceived "sins" against Islam. Residents of the Nahr el-Bared camp and surrounding areas on Tuesday described the men of the Fatah Islam militant group at the heart of the fighting as deeply religious and reclusive, rarely associating with those who lived there. Some roamed about with Kalashnikov rifles, wearing traditional Arab robes and beards without mustaches, a trademark of...