WASHINGTON (Reuters) - The FBI (news - web sites) on Thursday issued an alert seeking the public's assistance in locating a Saudi-born man who is it said may be connected to possible threats against the United States. The FBI issued a "be on the lookout" alert for Adnan G. El Shukrijumah, 27, who was born in Saudi Arabia and who it said may try to enter the United States with a Saudi, Canadian or Trinidad passport as well. "El Shukrijumah is possibly involved with al Qaeda terrorist activities and, if true, poses a serious threat to U.S. citizens and interests...