The Islamic State group is holding more captives, including several Americans, but the exact number is hard to pin down.
The U.K. doesn't negotiate with terrorists, but it's unclear if the government was involved in the exchange.
ISIS has continued to advance in Iraq and Syria amid airstrikes by a U.S.-led coalition in both countries.
Peter Kassig, who changed his name to Abdul-Rahman Kassig after converting to Islam in late 2013, said he was “at peace” with his beliefs.
FBI Director James Comey said Khorasan may still be working on an attack against the U.S. or its allies despite airstrikes in Syria.
Righters from Islamic State also reportedly were involved in the clashes.
Islamic State militants are "operating" in Abu Ghraib, which could be a launching pad for attacks on Baghdad.
The radical umbrella group wreaking havoc in Pakistan urges unity among like-minded radical Sunni Islamic militant groups.
The Iraqi town of Kubaisa fell into Islamic State group members' hands, two days after the militants seized Hit.
Prime Minister Stephen Harper said Canada seeks to "significantly degrade" the capabilities of the Islamic State group.
An upset victory by one of Dilma Rousseff's challengers could see Brazil increase global trade and rethink controversial foreign relationships.
It starts with a huge caravan of vehicles driving to a secret desert location, cameras, knives and victims in tow.
The Kurdish fighters in Kobane are battling ISIS and need Turkish military intervention, according to sources on the ground.
The Islamic State group threatened to kill American medic Peter Kassig next in a new beheading video released Friday.
The militant group released a fourth beheading video to send a 'message to America and its allies.'
The Syrian government appealed to the United Nations to stop Turkey from intervening in Syria.
Beiji is located 130 miles north Baghdad and is home to Iraq's biggest oil refinery.
While the identities of the other two Americans have not been revealed, one of them is believed to be Jordan Matson from Wisconsin.
Hundreds took to the streets of the Syrian city of Homs Thursday in protest after a suicide bomber killed 47 children in a school.
The decision comes amid increasing concerns over the number of Australians fighting for the Islamic State group in Iraq and Syria.
The Navy has called off the search for a Marine airman who bailed out of a plane.
Turkey's parliament voted to allow for military intervention in Iraq and Syria. Does the country present a united front against ISIS?