In the past 10 years since Columbine, there have been more than 60 school shootings in the U.S.
| Conyers, GA | May 1999 |
| Deming, NM | November 1999 |
| Fort Gibson,OK | December 1999 |
| Mt. Morris Township, MI | February 2000 |
| Savannah, GA | March 2000 |
| Prairie Grove, AR | May 2000 |
| Lake Worth, FL | May 2000 |
| New Orleans, LA | September 2000 |
| Baltimore, MD | January 2001 |
| Santee, CA | March 2001 |
| Williamsport, PA |
March 2001 |
| Granite Hills, CA | March 2001 |
| Gary, IN | March 2001 |
| Ennis, TX | May 2001 |
| Caro, MI | November 2001 |
| New York, NY | January 2002 |
| Gundy, VA | January 2002 |
| Bowie, MD | October 2002 |
| Tucson, AZ | October 2002 |
| New Orleans,LA | April 2003 |
| Red Lion, PA | April 2003 |
| Cleveland, OH | May 2003 |
| San Diego, CA | September 2003 |
| Fort Worth, TX | September 2003 |
| Hopkinsville, KY | September 2003 |
| Cold Springs, MN | September 2003 |
| Sugar Land, TX | November 2003 |
| Henderson, NV | January 2004 |
| Washington DC | February 2004 |
| Philadelphia, PA | February 2004 |
| Joyce, WA | March 2004 |
| Nine Miles Falls, WA | December 2004 |
| Cumberland City, TN | March 2005 |
| Reno, NV | March 2005 |
| Red Lake Indian Res.,MN | March 2005 |
| Saginaw, MI | October 2005 |
| Jacksboro, TN | November 2005 |
| Douglas County, OR | February 2006 |
| Washington DC |
April 2006 |
| Venice, CA | June 2006 |
| Modesto, CA | August 2006 |
| Essex, VT | August 2006 |
| Hillsborough, NC | August 2006 |
| Sheperdstown, WV | September 2006 |
| Pittsburgh, PA | September 2006 |
| Bailey, CO | September 2006 |
| Cazenovia, WI | September 2006 |
| Nickel Mines, PA | October 2006 |
| Joplin, MO | October 2006 |
| Tacoma, WA | January 2007 |
| Midland, MI | March 2007 |
| Gresham, OR | April 2007 |
| Seattle, WA | April 2007 |
| Blacksburg, VA (Virginia Tech) | April 2007 |
| Dallas, TX | June 2007 |
| Newark, NJ | August 2007 |
| Dover, DE | September 2007 |
| Cleveland, OH | October 2007 |
| Washington, DC | January 2008 |
| Baton Rouge, LA | February 2008 |
| Memphis, TN | February 2008 |
| Oxnard, CA | February 2008 |
| Portsmouth, OH | February 2008 |
| Dekalb, IL | February 2008 |
| Fort Lauderdale, FL | November 2008 |
The 13 victims of Columbine:
Cassie Bernall (age 17)
Steven Curnow (age 14)
Corey Depooter (age 17)
Kelley Fleming (age 16)
Matthew Kechter (age 16)
Dan Mauser (age 15)
Daniel Rohrbough (age 15)
Rachel Scott (age 17)
Isaiah Shoels (age 18)
John Tomlin (age 16)
Lauren Townsend (age 18)
Kyle Velasquez (age 16)
William “Dave” Sanders (age 47)