U.S. authorities made a fresh and urgent call for public help on Monday to find a Saudi-born man who could pose what they termed a “very, very serious” threat as part of an al Qaeda plot against the United States. Stepping up their search with an appeal to the U.S. Muslim community for information, the FBI said Adnan El Shukrijumah, who is not charged with a crime but is being sought for questioning, was a friend of a man now serving prison time for plotting to blow up Florida power plants. FBI officials said El Shukrijumah, 27, was believed to be involved in “al Qaeda terrorist activities.” “It is very important, very important, that we find him soon,” said Hector Pesquera, special agent in charge of the Miami FBI office, at a news conference. Agents have received at least two hundred calls from the public since issuing a “be on the lookout,” or BOLO alert, last Thursday for El Shukrijumah. The alert was based on information from Khalid Sheikh Mohammed, the detained alleged mastermind of the Sept. 11. hijacked airliner attacks on New York and Washington. Full Story