October 2008: Shirwa Ahmed, 26, a Somali-American from Minneapolis who went to Somalia, becomes the first U.S. suicide bomber.
March 2009: American-born Omar Hammami, also known as Abu Mansoor Al-Amriki, is featured in a terrorist recruitment video. Hammami, who grew up in Daphne, Ala., is considered a major player in Al-Shabaab efforts to recruit Muslims in the West.
September 2009: Afghan immigrant Najibullah Zazi, 25, is arrested for plotting to bomb New York City's subway system. He pleads guilty in February to the Al-Qaida-linked plot.
November 2009: Nidal Malik Hasan, 39, a U.S. Army major and American-born Muslim of Palestinian descent, is accused of killing 13 people and wounding 30 in a shooting at the Fort Hood, Texas, military base. Hasan reportedly expressed radical beliefs and e-mailed Anwar al-Awlaki, a spiritual leader and Al-Qaida talent recruiter and motivator.
December 2009: Five Muslim Americans from Washington, D.C., suburbs are arrested in Pakistan while en route to train to fight U.S. troops in Afghanistan. The men, friends in their late teens and 20s, had been in contact via YouTube and an Internet chat room with a Pakistani militant with links to Al-Qaida.
March 2010: Abu Yahya Mujahdeen al-Adam, an operative of Al-Qaida, is arrested in Pakistan. Born in Pennsylvania, al-Adam is believed to be affiliated with Al-Qaida's operations division.
March 2010: Colleen R. LaRose, 46, also known as "Jihad Jane," is accused in a federal indictment of trying to recruit jihadist fighters and plotting to murder a Swedish cartoonist. The suburban Philadelphia woman said in a YouTube video that she was "desperate to do something somehow to help" ease the suffering of Muslims.