Al-Qaida Al-Qaida

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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Mazhar Ali Khan/AP

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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EPA/Landov

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

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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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Reuters/Landov

Who Are America's Suspected ISIS Followers?

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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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AP

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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Susan Walsh/AP

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

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Boko Haram/Sendvid

Boko Haram Takes A Page From ISIS Propaganda Playbook

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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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Aurelien Meunier/Getty Images