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2001 anthrax attacks. A March 2004 State Department report on "Significant Terrorist Incidents, 1961-2003" quotes then-Attorney General John Ashcroft saying of the letters containing anthrax mailed to various targets: "When people send anthrax through the mail to hurt people and invoke terror, it's a terrorist act." Five people were killed as a result of those letters in the autumn of 2001.
2002 attack against El Al ticket counter at LAX. In July 2002, Hesham Mohamed Hadayet opened fire at an El Al Airlines ticket counter at Los Angeles International Airport killing two people and wounding four others before being shot dead. A 2004 Justice Department report stated that Hadayet's case had been "officially designated as an act of international terrorism."
2002 DC-area sniper. The state of Virginia indicted Washington, D.C.-area sniper John Allen Muhammad -- along with his accomplice, a minor at the time -- on terrorism charges for one of the murders he committed during a three-week shooting spree across Maryland, Virginia, and Washington, D.C. Muhammad was convicted, sentenced to death, and subsequently executed for the crime.
2006 UNC SUV attack. In March 2006, University of North Carolina-Chapel Hill graduate Mohammed Reza Taheri-azar drove an SUV into an area of campus, striking nine pedestrians. According to reports, Taheri-azar said he acted because he wanted to "avenge the deaths or murders of Muslims around the world." Taheri-azar also reportedly stated in a letter: "I was aiming to follow in the footsteps of one of my role models, Mohammad Atta, one of the 9/11/01 hijackers, who obtained a doctorate degree."