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The real terror threat in America is homegrown

By Peter Bergen, CNN National Security Analyst

Updated 1319 GMT (2119 HKT) June 13, 2016

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Police investigate the back of the Pulse nightclub in Orlando on Sunday, June 12. At least 49 people were killed there by Omar Mateen, who was shot and killed by Orlando police. It was the deadliest mass shooting in U.S. history.
Photos: Orlando nightclub shooting
Police investigate the back of the Pulse nightclub in Orlando on Sunday, June 12. At least 49 people were killed there by Omar Mateen, who was shot and killed by Orlando police. It was the deadliest mass shooting in U.S. history.
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Bodies arrive at the medical examiner's office on June 12.
Photos: Orlando nightclub shooting
Bodies arrive at the medical examiner's office on June 12.
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Friends and family react after a list of hospitalized victims is released June 12 outside a hotel near the Orlando Regional Medical Center.
Photos: Orlando nightclub shooting
Friends and family react after a list of hospitalized victims is released June 12 outside a hotel near the Orlando Regional Medical Center.
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Pastor Kelvin Cobaris embraces Orlando City Commissioner Patty Sheehan, right, and Terry DeCarlo, executive director of the LGBT Center of Central Florida, on June 12.
Photos: Orlando nightclub shooting
Pastor Kelvin Cobaris embraces Orlando City Commissioner Patty Sheehan, right, and Terry DeCarlo, executive director of the LGBT Center of Central Florida, on June 12.
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Jeremy Glatstein donates blood in Orlando on June 12. He drove an hour to the donation center to show his support for the shooting victims.
Photos: Orlando nightclub shooting
Jeremy Glatstein donates blood in Orlando on June 12. He drove an hour to the donation center to show his support for the shooting victims.
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A bomb disposal unit checks for explosives around the apartment building where Mateen is believed to have lived in Fort Pierce, Florida.
Photos: Orlando nightclub shooting
A bomb disposal unit checks for explosives around the apartment building where Mateen is believed to have lived in Fort Pierce, Florida.
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Ray Rivera, a DJ at the nightclub, is consoled by a friend outside of the Orlando Police Department.
Photos: Orlando nightclub shooting
Ray Rivera, a DJ at the nightclub, is consoled by a friend outside of the Orlando Police Department.
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Florida Gov. Rick Scott arrives at the scene.
Photos: Orlando nightclub shooting
Florida Gov. Rick Scott arrives at the scene.
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Police gather outside the home in Port St. Lucie, Florida, where Mateen's father lives.
Photos: Orlando nightclub shooting
Police gather outside the home in Port St. Lucie, Florida, where Mateen's father lives.
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Police officers gather outside of the nightclub, which describes itself as "the hottest gay bar" in the heart of Orlando.
Photos: Orlando nightclub shooting
Police officers gather outside of the nightclub, which describes itself as "the hottest gay bar" in the heart of Orlando.
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Ron Hopper of the FBI answers questions from members of the media on June 12. Listening are Orlando Police Chief John Mina, left, and Orange County Mayor Teresa Jacobs.
Photos: Orlando nightclub shooting
Ron Hopper of the FBI answers questions from members of the media on June 12. Listening are Orlando Police Chief John Mina, left, and Orange County Mayor Teresa Jacobs.