BERLIN (Reuters) - Al Qaeda is plotting to kidnap German and British citizens in Libya, the Spiegel weekly magazine quoted German intelligence sources as saying. Germany and Britain were among several Western countries to urge their nationals to leave the eastern Libyan city of Benghazi on Thursday, days after a deadly attack by Islamist militants in neighboring Algeria. Britain cited a "specific and imminent" threat to Westerners in Libya's second largest city, but officials declined to give any details. ...