The U.N. Security Council on Wednesday unanimously approved a historic resolution aimed at ending the flow of foreign extremists to the world's conflicts. President Obama thanked the council but warned that "a resolution alone will not be enough."
A photo released by the U.S. Navy shows the guided-missile cruiser USS Philippine Sea launching a Tomahawk cruise missile against Islamic State targets in Syria on Tuesday.
Eric Garst/U.S. Navy/EPA/Landov
In this image made from undated video obtained by The Associated Press, a man believed to be Peter Theo Curtis, a U.S. citizen held hostage by an al-Qaida linked group in Syria, delivers a statement.
Members of Jabhat al-Nusra clean their weapons, in Aleppo in December. The Islamist rebel group has become an increasingly powerful force in Syria's civil war.
Ahmed Jadallah/Reuters /Landov