He's called Sheik Terra. With a Koran in one hand and pistol in the other, the British rapper calls for the murder of non-Muslims, including several world leaders, on a videotape. The video is well known in one London mosque, whose imam — or leader — is accused of setting up a terrorist training camp in Oregon and whose followers don't like Western media. Bakri says the terrorists who staged the Sept. 11, 2001, attacks on the United States are magnificent and Westerners in Arab lands need to be killed by any means necessary. He makes the threats with a...