In 2003, Samir Khan launched a popular al-Qaida website from the basement of his parents' home in Charlotte, N.C. Today, he is believed to be behind an English-language al-Qaida magazine that reads like a glossy American publication -- except its topic is terrorism. Screen grab via YouTube/WJZY/WBTV hide caption

itoggle caption Screen grab via YouTube/WJZY/WBTV

Adnan Shukrijumah, shown here in undated photos from an FBI alert issued in March 2003, is believed to be the highest-ranking American in al-Qaida. He grew up in Florida and poses a new challenge to law enforcement: a terrorist who is not only familiar with the United States but deeply understands it. FBI/Getty Images hide caption

itoggle caption FBI/Getty Images