18 Sep 2001 West Palm Beach, FL 1 10 TER anthrax-laced letters mailed to West Palm Beach, Florida, USA, and New York City, New York
9 Oct 2001 Washington, DC 4 7 TER anthrax-laced letters mailed to Washington, DC
22 Dec 2001 Atlantic Ocean, FL 0 1 THW British citizen prevented from igniting shoe bomb on flight from Paris to Miami
8 May 2002 Chicago, IL 0 0 THW U.S. citizen arrested for seeking to use dirty bomb in US
4 Jul 2002 Los Angeles, CA 2 4 TER-islm Egyptian gunman kills two Israelis, injures four at the El Al ticket counter at the Los Angeles International Airport
5 Sep 2002 Clinton, MD 0 1 TER-bws owner of Italian restaurant shot in robbery by Beltway snipers
10 Sep 2002 Lackawanna, NY 0 0 THW 6 U.S. citizens arrested for terrorist connections
21 Sep 2002 Montgomery, AL 1 1 TER-bws liquor store employees shot in robbery by Beltway snipers
2 Oct 2002 Glenmont, MD 1 0 TER-bws 1 killed at grocery store by Beltway snipers
3 Oct 2002 Aspen Hill, MD 5 0 TER-bws 5 killed in separate shootings by Beltway snipers
4 Oct 2002 Spotsylvania County, VA 1 0 TER-bws 1 killed at shopping mall by Beltway snipers
7 Oct 2002 Bowie, MD 0 1 TER-bws 1 child injured at a middle school by Beltway snipers
9 Oct 2002 Manassas, VA 1 0 TER-bws 1 killed at gas station by Beltway snipers
11 Oct 2002 Fredericksburg, VA 1 0 TER-bws 1 killed at gas station by Beltway snipers
14 Oct 2002 Falls Church, VA 1 0 TER-bws 1 killed at shopping mall by Beltway snipers
19 Oct 2002 Ashland, VA 1 0 TER-bws 1 killed at restaurant by Beltway snipers
22 Oct 2002 Aspen Hill, MD 1 0 TER-bws 1 bus driver killed by Beltway snipers
19 Mar 2003 New York City, NY 0 0 THW U.S. citizen arrested for planning to sabotage Brooklyn Bridge
1 Jun 2003 Alexandria, VA 0 0 THW 11 arrested for planning attacks on U.S. servicemen
28 Nov 2003 Columbus, OH 0 0 THW arrest of terrorist plotting to bomb shopping mall in Columbus
1 Aug 2004 New York City, NY 0 0 THW 2 arrested planning to bomb Penn Station during Republican National Convention
1 Aug 2004 0 0 THW 2 arrested plotting assassination of Pakistani diplomat
3 Aug 2004 New York City, NY 0 0 THW terror cell leader arrested in London for planning attacks on financial centers in the US
21 Mar 2005 Red Lake, MN 10 7 CRI A student walked into a high school at Red Lake Indian Reservation, Minnesota, and shot multiple students and adults. Jeff Weise, a homebound student, shot and killed his grandfather and his grandfather's girlfriend. The grandfather was a police officer, and Weise then took two of the grandfather's service weapons and his squad car to Red Lack Senior High School. He entered the school about 2:50 PM, killing a security guard who confronted him, then fired on students and teachers in several classrooms. Within about 10 minutes, four police officers arrived and exchanged gunfight with Weise, after which Weise committed suicide. Five students at the school were killed (four 15-year-olds and one 14-year-old) plus one teacher and one security guard. Another seven students were injured (including four 15-year-olds).
1 Aug 2005 Los Angeles, CA 0 0 THW 4 arrested plotting attacks on Los Angeles targets
29 Nov 2005 Santa Cruz, CA 0 4 TER-left 4 injured, including several children, by incendiary attacks by suspected animal rights activists
5 Dec 2005 0 0 THW 1 arrested plotting attacks on refineries in Wyoming and New Jersey and on the transcontinental pipeline
5 Mar 2006 Chapel Hill, NC 0 9 TER-islm man drives vehicle into pedestrians at the University of North Carolina
22 Jun 2006 Chicago, IL 0 0 THW 7 arrested planning to bomb the Sears Tower
1 Jul 2006 New York City, NY 0 0 THW 1 arrested planning to bomb train tunnels
28 Jul 2006 Seattle, WA 1 5 TER-islm gunman fires on women at the Jewish Federation of Greater Seattle
9 Aug 2006 0 0 THW British authorities arrest 24 terrorists planning to use liquid explosives on airlines to attack US targets
27 Sep 2006 Bailey, CO 2 5 CRI At a high school in Bailey, Colorado, a man entered a classroom about 11:30 AM, fired a warning shot, and selected six female students as hostages before ordered the teacher and other students from the classroom. Several hundred other students in the school were evacuated by police over the next 20 minutes or so. Over the next few hours the man released four hostages, then set a deadline of 4 PM. When it became clear that the man was sexually assaulting the hostages, authorities chose to raid the classroom. The man fatally shot one hostage, then killed himself.
2 Oct 2006 Nickel Mines, PA 6 5 CRI A man entered a one-room Amish schoolhouse in Nickel Mines, Pennsylvania, about 10:00 AM, and ordered all but ten female students out of the schoolhouse. He then tied up the students and barricaded the doors with prepared wood he had brought to the site. An adult ran to a nearby building to call police; when police arrived, the man shot all the students and then killed himself. Five students died (ages, 7, 7, 8, 12, 13), and one more is not expected to survive.
9 May 2007 Cherry Hill, NJ 0 0 THW 6 arrested plotting armed attack on Fort Dix
3 Jun 2007 New York City, NY 0 0 THW 4 arrested in Trinidad plotting to bomb fuel pipelines near JFK airport
1 Aug 2007 Clinton, MI 0 1 CRI David Hahn was arrested 1 August 2007 for stealing smoke detectors, apparently to collect radioactive sources from them. He was specifically charged with stealing at least 13 smoke detectors (containing americium-241) from several buildings in his apartment complex. At the time his face was covered with open sores reported related to exposure to radioactive materials. On 27 August he plead guilty. On 2 October he was sentenced to a 90-day jail term to be served in six months after he is assessed and treated by doctors at a Veterans Administration Hospital.
24 Feb 2008 Los Angeles, CA 0 1 TER-left animal rights activists attempt home invasion of biomedical researcher, injuring the researcher's husband
27 Jul 2008 Knoxville, TN 2 7 TER gunman fires on congregation at a church
31 May 2009 Wichita, KS 1 0 TER-right one doctor killed (George Tiller) in shooting attack at Reformation Lutheran Church, Wichita, Kansas.
1 Jun 2009 Little Rock, AR 1 1 TER-islm one Army private killed (William Long), second injured in shooting attack at Army Navy Career Center, Little Rock, Arkansas.
10 Jun 2009 Washington, DC 1 1 TER-right one guard killed (Stephen Johns) in shooting attack at the Holocaust Museum, Washington, D.C.
11 Sep 2009 Owosso, MI 2 0 TER-left abortion protester shot and killed outside a school; the gunman also killed an area businessman
24 Sep 2009 Dallas, TX 0 0 THW terrorist arrested planning to bomb Dallas Fountain Place
5 Nov 2009 Foot Hood, TX 13 43 TER-islm shooting at Soldier Readiness Center
25 Dec 2009 MI 0 3 TER-islm Yemeni terrorist attempts to detonate bomb on flight from Amsterdam to Detroit; bomb only ignites, and passengers and crew subdue the terrorist
18 Feb 2010 Austin, TX 2 13 TER suicide crash of small plane into federal office building
4 Mar 2010 Alexandria, VA 1 2 TER shooting at gate outside Pentagon; gunman killed
1 May 2010 New York City, NY 0 0 THW failed car bombing in Times Square by Pakistani terrorists
17 Sep 2010 Washington, DC 0 1 THW attempted shooting at Capitol Hill; gunman shot and injured by guards
29 Oct 2010 NY? 0 0 THW thwarted attempt to bomb multiple US-bound airliners with parcel bombs sent from Yemen
8 Jan 2011 Tucson, AZ 6 13 TER shooting attack at political event at a supermarket; U.S. District Judge John Roll killed, U.S. Representative Gabrielle Giffords injured
27 Jul 2011 Killeen, TX 0 0 THW thwarted attempt to attack restaurant near Fort Hood with bombing and shooting attack; Naser Abdo arrested
6 Sep 2011 Carson City, NV 5 7 CRI shooting attack at restaurant, killing 4 (2 died immediately, 2 died later of injuries) and injuring 7 others; casualties included 3 Nevada National Guard soldiers killed and 2 injured; gunman also died of self-inflicted wounds
A list of terror attack in the US since 9/11. Could not count them all.