Washington, UNITED STATES: The terrorist threat advisory is seen 10 August, 2006 at Ronald Reagan National Airport, in Washington, DC. After Britain said 10 August it had thwarted a plot to wreak "mass murder" by the simultaneous mid-air bombings of planes to the United States, the US raised the threat level to "severe" or "Red" for all commercial flights flying from Britain to the United States, and "high" or "Orange" for all commercial aviation operating in the United States, including international flights. AFP PHOTO / TIM SLOAN (Photo credit should read TIM SLOAN/AFP/Getty Images)
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What FBI director wants Americans to know about terror
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FBI Director James Comey briefs the media on what U.S. citizens should do to help thwart terror threats in the country.
1:11 • Source: CNN
Terror threats in the U.S. 16 videos
Washington, UNITED STATES: The terrorist threat advisory is seen 10 August, 2006 at Ronald Reagan National Airport, in Washington, DC. After Britain said 10 August it had thwarted a plot to wreak "mass murder" by the simultaneous mid-air bombings of planes to the United States, the US raised the threat level to "severe" or "Red" for all commercial flights flying from Britain to the United States, and "high" or "Orange" for all commercial aviation operating in the United States, including international flights. AFP PHOTO / TIM SLOAN (Photo credit should read TIM SLOAN/AFP/Getty Images)
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What FBI director wants Americans to know about terror
01:11
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Armed police operate in Saint-Denis, a northern suburb of Paris, Wednesday, Nov. 18, 2015. Police say two suspects in last week's Paris attacks, a man and a woman, have been killed in a police operation north of the capital. Two police officers have been injured in the standoff. Police have said the operation is targeting the suspected mastermind of last week's attacks, believed to be holed up in an apartment in Saint-Denis with several other heavily armed suspects. (AP Photo/Francois Mori)
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Nadir Soofi, left, and Elton Simpson are the two suspects in the Garland, Texas shooting.
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Investigators work a crime scene before the removal a two bodies outside of the Curtis Culwell Center after a shooting occurred the day before May 04, 2015 in Garland, Texas. During the "Muhammad Art Exhibit and Cartoon Contest, " an anti-Islam event, on May 03, Elton Simpson of Phoenix, Arizonia and another man opend fire, wounding a security guard . Police officers shot and killed Simpson at the scene.
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Could Texas terror attack have been prevented?
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Somali Al-Shebab fighters gather on February 13, 2012 in Elasha Biyaha, in the Afgoei Corridor, after a demonstration to support the merger of Al-shebab and the Al-Qaeda network. Shebab insurgents staged rallies across Somalia on February 13 to celebrate their group's recognition by Osama bin Laden's successor as a member of the Islamist Al-Qaeda network. Al-Qaeda chief Ayman al-Zawahiri announced in a video message posted on jihadist forums on February 9, 2012 that Shebab fighters had joined ranks with the Islamist network. AFP PHOTO / Mohamed Abdiwahab (Photo credit should read Mohamed Abdiwahab/AFP/Getty Images)
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ISIS celebrates announcement of their "Caliphate." Caption: This photo was tweeted from a Twitter account widely believed to belong to ISIS in Aleppo, Province, Syria. It purportedly shows celebrating ISIS' announcement of the so called Islamic Caliphate, spanning large areas of Iraq and Syria. The Islamic State in Iraq and Syria (ISIS) is a Sunni Muslim extremist group formerly linked to al-Qaeda-- al Qaeda has since denounced ISIS.
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