Dina Temple-Raston

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Life changed as Sadiik Yusuf knew it about two years ago, when the FBI appeared at his front door in Minneapolis to tell him his son Abdullahi had been stopped at the airport, suspected of trying to board a flight that would take him to Syria to fight with ISIS.

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NPR has obtained what investigators believe could be the Dallas gunman's manifesto. It appeared underneath a photo of the man on social media. And for more on that, we turn to NPR's Dina Temple-Raston. Hi, Dina.

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Police in Orlando Florida say 50 people were killed when a gunman began shooting in a popular nightclub. When he took hostages, that's when the SWAT team went in. The gunman was killed, but not before perpetrating the deadliest mass shooting in U.S. history.

All eyes were on 20-year-old Abdullahi Yusuf when he stepped on the stand in federal court last week in Minneapolis to testify for the prosecution in America's largest ISIS recruitment trial.

As Yusuf began to speak, his words provided a rare, behind-the-scenes look at how more than a dozen young men convinced themselves that the way to prove they were good Muslims was to travel to Syria and fight for ISIS.

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Nearly all of the men implicated in last week's attack in Brussels and the November rampage in Paris have something in common – they are ex-convicts.

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