Deadliest Shootings

These sad events have shocked us all.

Washington Navy Yard - Aaron Alexis, 34, opened fire Monday morning at the Washington Navy Yard on Sept. 16, 2013, killing 12. Alexis was a full-time Navy reservist based in Texas when he left service in 2011. He was killed by the police. ?Naeesa Aziz, Britt Middleton and BET.com staff(Photo: Alex Wong/Getty Images)

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Washington Navy Yard - Aaron Alexis, 34, opened fire Monday morning at the Washington Navy Yard on Sept. 16, 2013, killing 12. Alexis was a full-time Navy reservist based in Texas when he left service in 2011. He was killed by the police. —Naeesa Aziz, Britt Middleton and BET.com staff(Photo: Alex Wong/Getty Images)

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Sandy Hook Elementary School - As morning classes got underway on Dec. 14, a gunman opened fire at Sandy Hook Elementary School in Newtown, Connecticut.  According to officials, at 27 people — including 18 children and the gunman — were killed. The shooter was identified as 20-year-old Adam Lanza.  (Photo: AP Photo/Newtown Bee, Shannon Hicks)

Oak Creek, Wisconsin - Seven people were killed, including the gunman, after a man opened fired at a Sikh temple in Oak Creek, Wisconsin, on Aug. 5. Suspected shooter Wade Michael Page allegedly had ties to white supremacist groups. (Photo: AP Photo/Jeffrey Phelps)

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Oak Creek, Wisconsin - Seven people were killed, including the gunman, after a man opened fired at a Sikh temple in Oak Creek, Wisconsin, on Aug. 5. Suspected shooter Wade Michael Page allegedly had ties to white supremacist groups. (Photo: AP Photo/Jeffrey Phelps)

Americans Keep Close Eye on Colorado Shooting  - Between July 26 and 29, Americans were most captivated by news about the deadly shooting spree at a movie theater in Aurora, Colorado, with 41 percent reporting in a Pew Center poll that they followed the story closely.  Separately, 32 percent said they focused on the U.S. economy, 25 percent focused on the 2012 presidential election and 19 percent focused on the London Olympics. (Photo: EPA/BOB PEARSON /LANDOV)

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Twelve Killed in Movie Theater Shootings - A lone gunman opened fire in an Aurora, Colorado movie theater July 20, 2012, during opening night of the Batman movie The Dark Knight Rises, killing 12 people and wounding 59.(Photo: EPA/BOB PEARSON /LANDOV)

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Norwegian Massacre - On July 22, 2011, Norwegian Anders Behring Breivik, 33, killed at least 80 people at a summer camp on the Norwegian island of Utoya.  (Photo: AP Photo/Fartein Rudjord)

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Fort Hood Shooting - Army psychiatrist Maj. Nidal Hasan is accused of killing 13 soldiers and civilians and wounding two-dozen others when he opened fire at the Soldier Readiness Processing Center at Fort Hood, Texas, on Nov. 5, 2009.     (Photo: Joe Raedle/Getty Images)

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Fort Hood Shooting - Army psychiatrist Maj. Nidal Hasan is accused of killing 13 soldiers and civilians and wounding two-dozen others when he opened fire at the Soldier Readiness Processing Center at Fort Hood, Texas, on Nov. 5, 2009.   (Photo: Joe Raedle/Getty Images)

Tragedy in Alabama - Alabama resident Michael McLendon, 28, went on a rampage, killing 10 people ? including his mother and four other relatives ? before taking his own life on March 10, 2009. (Photo: Hare/AP)

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Tragedy in Alabama - Alabama resident Michael McLendon, 28, went on a rampage, killing 10 people — including his mother and four other relatives — before taking his own life on March 10, 2009. (Photo: Hare/AP)

Armed Security at Schools - ?Five years ago, after the Virginia Tech tragedy, when I said we should put armed security in every school, the media called me crazy. But what if, when Adam Lanza started shooting his way into Sandy Hook Elementary School last Friday, he had been confronted by qualified, armed security??  (Photo: AP Photo/Newtown Bee, Shannon Hicks)

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Virginia Tech - On April 16, 2007, 23-year-old Virginia Tech student Seung-Hui Cho shot and killed 32 people on the school’s campus in Blacksburg, Virginia. (Photo: Mario Tama/Getty Images)

Columbine - High school students Eric Harris, 18, and Dylan Klebold, 17, opened fire at Columbine High School in Littleton, Colorado, on April 20, 1999, killing 12 classmates and a teacher and wounding 26 others before taking their own lives. (Photo: REUTERS /Landov)

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Columbine - High school students Eric Harris, 18, and Dylan Klebold, 17, opened fire at Columbine High School in Littleton, Colorado, on April 20, 1999, killing 12 classmates and a teacher and wounding 26 others before taking their own lives. (Photo: REUTERS /Landov)

Tragedy Down Under - On April 28, 1996, in Tasmania, Australia, Martin Bryant, 29, shot 20 people at a seaside resort before killing 15 others on the drive away from the scene.  (Photo: REUTERS/Ian Waldie/Pool /Landov)

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Tragedy Down Under - On April 28, 1996, in Tasmania, Australia, Martin Bryant, 29, shot 20 people at a seaside resort before killing 15 others on the drive away from the scene.  (Photo: REUTERS/Ian Waldie/Pool /Landov)

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Shooting in Scotland - Thomas Hamilton, 43, opened fire on a kindergarten class in Dunblane, Scotland, killing 16 children and their teacher before killing himself on March 13, 1996. (Photo: PA Photos /Landov)

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Shooting in Scotland - Thomas Hamilton, 43, opened fire on a kindergarten class in Dunblane, Scotland, killing 16 children and their teacher before killing himself on March 13, 1996. (Photo: PA Photos /Landov)

Killer in Killeen, Texas - In Killeen, Texas, on Oct. 16, 1991, George Hennard opened fire at a Luby?s Cafeteria, killing 23 people before killing himself.(Photo: AP)

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Killer in Killeen, Texas - In Killeen, Texas, on Oct. 16, 1991, George Hennard opened fire at a Luby’s Cafeteria, killing 23 people before killing himself.(Photo: AP)

Going Postal - Oklahoma postal worker Pat Sherrill, 44, killed 14 people at a post office before killing himself on Aug. 20, 1986.(Photo: Courtesy of Wiki Commons)

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Going Postal - Oklahoma postal worker Pat Sherrill, 44, killed 14 people at a post office before killing himself on Aug. 20, 1986.(Photo: Courtesy of Wiki Commons)

Murder at Mickey D's - Out-of-work security guard James Oliver Huberty killed 21 people in a McDonald's restaurant in San Ysidro, California, on July 18, 1984.(Photo: Courtesy of ABC News)

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Murder at Mickey D's - Out-of-work security guard James Oliver Huberty killed 21 people in a McDonald's restaurant in San Ysidro, California, on July 18, 1984.(Photo: Courtesy of ABC News)

Hungerford Massacre - On Aug. 19, 1987, Michael Ryan killed 16 people in the town of Hungerford, England, and then killed himself.(Photo: Courtesy of Wiki Commons)

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Hungerford Massacre - On Aug. 19, 1987, Michael Ryan killed 16 people in the town of Hungerford, England, and then killed himself.(Photo: Courtesy of Wiki Commons)