Brian Ross Reports: More than 5,000 terrorists have been captured or killed in the five years since the 9/ll attacks, CIA director Gen. Michael Hayden said today. Hayden's remarks were made in a videotape statement distributed to CIA employees around the world. Hayden called the 9/ll attacks "an unforgettable blow" from a "plot we had not been able to prevent." Since then, he said, "Al-Qa'ida's core operational leadership has been decimated, and their successors are in hiding or on the run." Hayden paid tribute to four CIA employees killed in Afghanistan: Mike Spann, Helge Boes, Chris Mueller and William Carlson....