‘Slow progress’ for U.S. on addressing terrorism in Africa

The U.S. is sending a team of military, law enforcement and hostage negotiators to Nigeria to join efforts to locate the girls who were kidnapped by Islamist militants in Nigeria. Gwen Ifill talks to Linda Thomas-Greenfield, Assistant Secretary of State for African Affairs, about the tools available to track the whereabouts of the girls and what’s been going on diplomatically behind the scenes.