Experts say recent attacks back up the findings of a controversial Department of Homeland Security report.
Two are still in custody. The case is seen as a test of the new agreement between the US and Iraq that allows Americans to be tried in the Iraqi legal system.
Did alleged attacker Abdulhakid Mujahid Mohammed act on his own, or was he a trained jihadist?
The man charged with murder in the Holocaust Museum shooting gave clear clues about his hatred of Jews on the Web. But it's hard for law enforcement to filter anger from murderous intent.
Information from "black boxes" and other sources could help prevent future accidents.
In 1996, a Kansan with the same name was arrested with bombmaking materials in his car trunk.
The move to create a position to safeguard the country's computer networks comes as the Pentagon plans to create a military command for cyberwarfare.