A screenshot of Lucas Kinney, a 26-year-old Briton who recently began making videos for Jabhat al-Nusra, the al-Qaida affiliate in Syria. Kinney's father is a veteran Hollywood assistant director who helped make such films as Rambo and the Indiana Jones series. Via YouTube hide caption

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A 1998 file photo of Ayman al-Zawahri speaking at a news conference in Khost, Afghanistan. The reclusive al-Qaida leader says he has pledged support to the new chief of the Taliban, Mullah Akhtar Mansoor. Mazhar Ali Khan/AP hide caption

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An undated file picture shows Osama bin Laden. A new Wikileaks release purports to reveal that one of his sons requested a death certificate for the al-Qaida leader, who was killed in a U.S. military raid in 2011. EPA/Landov hide caption

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An image of Mokhtar Belmokhtar from the U.S. State Department's wanted poster in the Rewards for Justice program. Belmokhtar was a leading figure in al-Qaida in the Islamic Maghreb. U.S. Department of State hide caption

toggle caption U.S. Department of State

An Islamic State fighter holds holds a rifle and the group's flag shortly after capturing the northern Iraqi city of Mosul in June 2014. Dozens of Americans have been accused of planning or heading off to the Middle East to join the group. Their individual cases are on the chart below. Reuters/Landov hide caption

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Who Are America's Suspected ISIS Followers?

More than 60 U.S. citizens have been accused of joining or supporting the Islamic State in the past two years. NPR has documented their individual cases.

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This image made from video released to reporters in Pakistan in 2013 shows Warren Weinstein, the U.S. aid worker who was kidnapped in Pakistan by al-Qaida in 2011. The White House says Weinstein and another hostage were inadvertently killed during U.S. counterterrorism operations in a border region of Afghanistan and Pakistan in January. AP hide caption

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President Obama expresses his condolences today to the families of the American and Italian aid workers killed in a U.S. counterterrorism operation in January. Susan Walsh/AP hide caption

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The most recent propaganda videos from Boko Haram have higher production values than in the past and other similarities to ISIS-produced videos. Boko Haram/Sendvid hide caption

toggle caption Boko Haram/Sendvid

Police officers look for an escaped suspect Jan. 9 in Porte de Vincennes in Paris, France. Hayat Boumeddiene, 26, escaped and is wanted in connection with the murder of a policewoman. Aurelien Meunier/Getty Images hide caption

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