Mindy Corporon speaks during a news conference, flanked by Will Corporon (left) and Tony Corporon, at their church in Leawood, Kan., on Monday. Their father, Dr. William Corporon, and Mindy Corporon's 14-year-old son were killed during Sunday's shooting at the Jewish Community Center in Overland Park, Kan. Orlin Wagner/AP hide caption

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Frazier Glenn Cross, also known as Glenn Miller, is accused of killing three people Sunday in Kansas City. He allegedly attacked them at a Jewish community center and a Jewish retirement facility. Johnson County, Kan., Sheriff's Office hide caption

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Bob Butler (left) and Bob Gordon paint crosses they placed in front of American flags at Central Christian Disciples of Christ church in the city of Killeen, Texas, which is home to Fort Hood. Joe Raedle/Getty Images hide caption

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Sgt. First Class Erick Rodriguez stood guard at the entrance to Fort Hood as officials prepared to brief the news media about Wednesday's attack at the post. Erich Schlegel /Reuters/Landov hide caption

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Flowers, candles and stuffed animals at a makeshift memorial in Newtown, Conn., the week after 20 children and 6 adults were killed at Sandy Hook Elementary School. Eric Thayer/Reuters/Landov hide caption

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Two people hug early Tuesday after reaching safety outside the Garden State Plaza Mall in Paramus, N.J. A gunman fired several shots there Monday night, sending shoppers and employees scrambling. No one was hurt. Hours later, the suspected gunman's body was found. Police believe he shot himself. Julio Cortez/AP hide caption

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Workers emerge from a building after a deadly shooting at the Washington Navy Yard on Monday. There are multiple injuries and deaths, and one gunman is dead. Police say they are searching for two other "potential" shooters. Alex Wong/Getty Images hide caption

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Hadiya Pendleton. Courtesy of Pendleton family via the Chicago Tribune /MCT /Landov hide caption

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