Las Ramblas in Barcelona one day after terror attack
Public area reopens one day after van plowed into a crowd of pedestrians.
Japan's Prime Minister Remarks at Pearl Harbor Ceremony
Prime Minister Abe of Japan visits the USS Arizona Memorial in Pearl Harbor with President Obama.
ARCHIVAL VIDEO : Inside Chernobyl 5 Years Later
April 22, 1991: A look inside Chernobyl five years after the devastating disaster.
Democratic Candidates Debate Gun Control Laws
The candidates discuss the most important issues at the ABC News Democratic presidential debate.
Fear of Copycat Terror Attacks Puts America on Edge
Cities, airports and stadiums step up security with practice drills and armed officers ready to spring into action amid the promise of attacks from ISIS.
Americans Describe the Moment a Hotel Attack Began in Mali
Two Americans share their terrifying experience, which resulted in the death of at least 19 people.
Brussels on High Alert
We begin with that security lockdown in Europe's capital, subways and stores closed, events canceled, Americans warned to stay indoors. Because of an imminent terror threat. Our chief global affairs correspondent Martha Raddatz is on the scene in Brussels with the latest. Good morning, Martha.
Gunmen Take 170 People Hostage in Mali , Africa
At least 27 dead in a terror attack that lasted for hours in a hotel popular with Westerners.
Mali Hotel Attack: How The Deadly Hostage Situation Unfolded
Watch how the deadly hostage situation at the Radisson Blu Hotel in Bamako, Mali unfolded after gunmen took 170 people, including U.S. citizens, captive in the country's capital.
Mali Hotel Hostage Situation Ends With 6 Americans Among the Rescued
At least 18 people are dead, according to Olivier Salgado of the United Nations Stabilization Mission in Mali.