In this photo taken from the Turkish side of the border between Turkey and Syria, smoke billows from a fire inside Syria during bombardment by Turkish forces on Wednesday.
Bulent Kilic/AFP via Getty Images
A U.S. drone aircraft used a Hellfire missile to hit a target that was believed to include Mohammed Emwazi, known as "Jihadi John," seen here in an image made from a militant video that has been verified by SITE Intel Group.
American journalist Steven Sotloff (left) talks with Libyan rebels on the Al Dafniya front line on June 2, 2011, in Misrata, Libya. Sotloff was kidnapped in August 2013 near Aleppo, Syria.
Etienne de Malglaive via Getty Images
Secretary of Defense Chuck Hagel (left) and Chairman of the Joint Chiefs of Staff Gen. Martin Dempsey during a Pentagon briefing on Thursday. Hagel said Islamic State militants in Iraq and Syria posed a threat "beyond anything we've seen."
President Obama leaves after making a statement Wednesday about the killing of journalist James Foley in Syria. The president said the U.S. would continue to confront Islamic State extremists despite the brutal murder.
President Obama said Wednesday that the extremist group that carried out the beheading of U.S. journalist James Foley engages in "cowardly acts of violence" and "has no place in the 21st century."