Police officers stand guard down the street from the scene of a deadly mass shooting at the Pulse Orlando nightclub in Orlando, Fla., early in the morning on Sunday. Authorities say at least 50 people died in the attack. Phelan M. Ebenhack/AP hide caption

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Phelan M. Ebenhack/AP

(Top) A candlelight vigil following the shootings on the Virginia Tech campus in Blacksburg, Va., on April 17, 2007. (Left) Blacksburg police officers run from Norris Hall on the Virginia Tech campus in Blacksburg on April 16, 2007. (Right) A Virginia Tech student stands by a cardboard "VT" that was part of a makeshift vigil placed on a drill field at Virginia Tech on April 17, 2007. Charles Dharapak; Matt Gentry/The Roanoke Times; Casey Templeton/AP hide caption

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Charles Dharapak; Matt Gentry/The Roanoke Times; Casey Templeton/AP

A mugshot and rap sheet of Jason Dalton, who police say went on a shooting spree that lasted for hours in Kalamazoo, Mich., on Saturday. Kalamazoo Public Safety hide caption

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Kalamazoo Public Safety

Guns seized by the police are displayed during an Oct. 2015 news conference in New York. Seth Wenig/AP hide caption

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Seth Wenig/AP

The U.S. Has A Mass Shooting Epidemic, But No Government Database On Gun Violence

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Gary Waters/Getty Images/Ikon Images

When Mass Shootings Happen, How Survivors Learn To Cope

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People hold candles during a vigil for shooting victims in San Bernardino, California. Mark J. Terrill/AP hide caption

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Mark J. Terrill/AP

After Mass Shootings, People Turn To Prayer — And Prayer Shaming

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Nasya Fair and her son Korbyn, 4, look at a growing memorial for the Colorado Springs, Colo., shooting victims. Colorado and California are the latest states at the center of the gun control debate. Brent Lewis/Denver Post via Getty Images hide caption

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Brent Lewis/Denver Post via Getty Images

From Colorado To California, The Gun Control Debate Has Become Personal

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Pictures of the Sandy Hook Elementary School shooting victims are displayed as California Democratic Sen. Dianne Feinstein speaks during a 2013 Senate hearing. Wednesday's shooting in San Bernardino, which killed 14 people, was the deadliest since the 2012 shooting at Sandy Hook, which left 26 people dead. Jewel Samad /AFP/Getty Images hide caption

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Jewel Samad /AFP/Getty Images

Hundreds of people gathered for a vigil in Roseburg, Ore., Thursday night, after 10 people died and seven others were wounded in a shooting at the local community college. Josh Edelson/AFP/Getty Images hide caption

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Josh Edelson/AFP/Getty Images

Oregon Community Seeks Answers

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A patient is wheeled into the emergency room at Mercy Medical Center in Roseburg, Ore., following a deadly shooting at Umpqua Community College in Roseburg on Thursday. Aaron Yost/Roseburg News-Review via AP hide caption

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Aaron Yost/Roseburg News-Review via AP

Hear A Witness Describe The Scene During Shooting

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The casket of Ethel Lance is carried to a hearse following her funeral service on June 25. Lance was one of nine people killed in the shooting at Emanuel AME Church in Charleston. David Goldman/AP hide caption

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David Goldman/AP

Officials stand by the scene outside a movie theater where a man opened fire on filmgoers Thursday in Lafayette, La. At least two were fatally wounded and seven others injured before the gunman killed himself. Lee Celano/Reuters/Landov hide caption

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Lee Celano/Reuters/Landov

Chattanoogans Find Killings Of Four Marines 'Incomprehensible'

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Charleston residents visit a makeshift memorial for victims of Wednesday's mass shooting at the Emanuel AME Church on Calhoun Steet in Charleston, S.C. Randall Hill/Reuters /Landov hide caption

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Randall Hill/Reuters /Landov

This image of the trustees of Emanuel AME appeared in the 1916 book, Centennial Encyclopedia of the African Methodist Church, by Richard R. Wright. Rare Book Collection, Wilson Special Collections Library, University of North Carolina at Chapel Hill hide caption

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Rare Book Collection, Wilson Special Collections Library, University of North Carolina at Chapel Hill