Militants Loyal to ISIS Unveil Leaders for Af-Pak Region

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Former Pakistani Taliban members now loyal to Islamic State declared their intention to step up operations on the Afghanistan-Pakistan border — territory where the Taliban has long held sway.

‘El Chapo’ Guzmán to Be Extradited to U.S.

Joaquin "El Chapo" Guzman, the world's most wanted drug lord, is back in prison in Mexico. Mexico said that it will act on U.S. requests to extradite the drug lord. Photo: AP

Merkel Calls for Tighter Laws on Convicted Migrants

German Chancellor Angela Merkel on Saturday said convicted asylum seekers could be deported more quickly. The move is in response to allegations of mass assaults by migrants in Cologne on New Year's Eve. Photo: Getty

The Deadly Explosive Power of a Hydrogen Bomb

A hydrogen bomb—the type North Korea claims it tested—is many magnitudes more powerful than an atomic bomb, which was the type dropped on Hiroshima, Japan, during World War II, killing 70,000. Here’s a look at how a so-called H-bomb works.

Biggest Galaxy Cluster in Early Universe Found

A group of U.S. astronomers, including those from the University of Missouri and MIT, used data from three of NASA's Great Observatories to study the most massive cluster ever found in the early universe. WSJ's Monika Auger reports. Photo: NASA/CXC/Univ of Missouri/M.Brodwin

Ramadi Liberated, but Ruined

Iraq’s Prime Minister declared Ramadi liberated of Islamic State nearly two weeks ago. But the fight to free the city has left it in ruins. Matt Bradley reports from Ramadi.

Christie vs. Rubio: War of Words Heats Up

Chris Christie used the pop hit "Hello" by singer Adele in his latest ad targeting Marco Rubio. Indeed, there nothing sweet or sentimental about the words being exchanged: the two are both trying to attract a similar pool of voters, and are issuing tough talk and tough ads.

Mexican Drug Lord ‘El Chapo’ Guzmán Recaptured

The Mexican government recaptured the fugitive drug kingpin, Joaquin “El Chapo” Guzman Friday, according to a Twitter post from Mexican President Enrique Peña Nieto. Image: Associated Press

Philly Police Shooting Suspect Pledges ISIS Allegiance

Philadelphia police have arrested a man who allegedly opened fire on an officer Thursday night, in what officials describe as an ambush by a man who pledged allegiance to Islamic State. Image: Associated Press

U.S. Officials: Refugees Lied About Terror Ties

U.S. authorities say that two Iraqi refugees arrested on Thursday in California and Texas represented a potential safety threat. How will this factor into the ongoing political debate over migrants from the Middle East? WSJ’s Jason Bellini has #TheShortAnswer.