10 Biggest Manhunts of All Time

Adam Yahiye Gadahn
This FBI alert shows Adam Yahiye Gadahn, aka Adam Pearlman, a California native who was highlighted in May 2004 as the person most likely to be involved in or have knowledge of the next al-Qaida attack. FBI via Getty Images

Adam Yahiye Gadahn was born in 1978 to California goat farmers and homeschooled until age 17. And then things got a little weird.

Gadahn converted to Islam, joined a California mosque, punched its leader and moved to Pakistan, where he became a militant Islamist. After the terrorist attacks in New York and Pennsylvania on Sept. 11, 2001, Gadahn stepped forward as al-Qaida's unofficial spokesman and was videotaped threatening more attacks against the U.S.

In 2006, on the fifth anniversary of 9/11, he released a video in support of the attacks, and one month later was charged in U.S. courts with treason. The State Department continues to hunt for Gadahn, believed to be hiding overseas, and is offering a $1 million reward for information leading to his arrest [source: CNN].