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U.S. steps up security ahead of holiday
The Lead
Federal, state and local law enforcement agencies are on high alert this Fourth of July weekend. CNN's Jim Sciutto reports.
1:48 • Source: CNN
Terror threats in the U.S. 16 videos
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U.S. steps up security ahead of holiday
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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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What to do in the event of a terror attack
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This is the safest time in history
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How vulnerable are citizens to terror attacks?
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Nadir Soofi, left, and Elton Simpson are the two suspects in the Garland, Texas shooting.
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Are lone wolf terror attacks happening in U.S.?
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Trump: Waterboard terror suspects for information
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How do we track potential terrorists?
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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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Why Al-Shabaab is a growing threat
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ISIS and the power of terror
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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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NSA chief: New blind spots in tracking terrorists
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Preparing for mass shootings
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Al-Shabaab threatens to attack American mall
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Is it ISIS, ISIL or Daesh?
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Airports tightening security amid terrorism fears
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Obama: This is insane
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• Source: The White House