Terrorism Terrorism

Investigators prepare to enter one of the residences where suspect Edward Archer lived in Yeadon, Pa. Archer is accused of ambushing a police officer in Philadelphia on Jan. 7. The FBI has said it is investigating the attack as a possible act of terrorism — inspired by ISIS. Matt Rourke/AP hide caption

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Matt Rourke/AP

What Does It Mean If An Attack Is 'ISIS-Inspired'?

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Ambulances and police are seen at the blast site after an explosion in Istanbul's central Sultanahmet district. At least 10 people were killed and 15 wounded in a suicide bombing near tourists in central Istanbul's historic Sultanahmet district. Can Erok/Getty Images hide caption

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Can Erok/Getty Images

Explosion In Heart Of Istanbul's Tourist Area Kills At Least 10

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Members of the Los Angeles Police Department's elite Metropolitan Division participate in a simulation of a Paris-style coordinated attack. The team was tested on response time to converge on this site. Martin Kaste/NPR hide caption

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Martin Kaste/NPR

In Wake Of Attacks, U.S. Cities Step Up Terrorism Simulations

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After recent terrorist attacks, social media companies are under pressure to do more to stop messaging from terrorist groups. Patrick George/Ikon Images/Getty Images hide caption

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Patrick George/Ikon Images/Getty Images

What Can — Or Should — Internet Companies Do To Fight Terrorism?

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This undated file image posted on a militant website on Jan. 14, 2014, shows fighters from the Islamic State of Iraq and the Levant (ISIL) marching in Raqqa, Syria. Uncredited/AP hide caption

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Uncredited/AP

The Psychology Of Radicalization: How Terrorist Groups Attract Young Followers

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Olympic team members stand on the field as the Olympic flag flies at half-staff during a memorial service in the Munich Olympic Stadium in Germany on Sept. 6, 1972. Eleven Israeli team members were killed by Arab guerrillas at the Summer Olympic Games. A crowd of 80,000 filled the stadium to capacity. AP hide caption

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AP

Monument Underway For Slain 1972 Israeli Olympians

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President Obama, photographed from the Rose Garden, delivers a prime-time televised address marking the the end of combat mission in Iraq from the Oval Office in 2010. Susan Walsh/AP hide caption

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Susan Walsh/AP