LONDON — Britain's crackdown on Islamic extremism widened Friday as officials barred radical Muslim cleric Omar Bakri Mohammed from returning to the country that has been his home for the past two decades. Bakri's close associate, Anjem Choudary, told The Associated Press that the ban would not silence the cleric, who left Britain for Lebanon after saying he would not tell police if he knew fellow Muslims were planning attacks such as last month's deadly transit bombings in London. "With the Internet and other means, we can still hear from him wherever he is preaching," Choudary said. "I don't think...