Gurdeep Shergill and his wife, Sonia, co-host a program on KBIF-AM for the 35,000 Sikh-Americans who live in Fresno. Richard Gonzales/NPR hide caption

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Sikhs In Fresno Worried After Recent Attacks
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Dylann Roof faces nine counts of murder as well as charges of attempted murder and a weapons charge in connection with the June 17 killings inside the Emanuel AME Church in Charleston, S.C. Getty Images hide caption

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Dylann Roof, seen here at a recent court hearing in Charleston, S.C., will face federal hate crime charges over a mass shooting that police say he carried out at a black church. Grace Beahm/AP hide caption

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Some colleges and police departments are starting to use software that scans social media to identify local threats, but most tips still come from members of the public. Ikon Images/Getty Images hide caption

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Awash In Social Media, Cops Still Need The Public To Detect Threats
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This image provided by the Durham County Sheriff's Office shows a booking photo of Craig Stephen Hicks, 46, who was arrested on three counts of murder early Wednesday. On his Facebook page, Hicks described himself as a gun-toting atheist. Durham County Sheriff's Office/AP hide caption

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Some See Extreme 'Anti-Theism' As Motive In N.C. Killings
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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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