PBS Newshour: U.S. military sends plane to scan for abducted girls in Nigeria

Nigeria's government confirmed that a "window of negotiation" is open to Boko Haram with respect to the return of hundreds of teenage girls kidnapped from a school in a remote village. Meanwhile the U.S. began manned surveillance flights over the region and authorities tried to piece together how the attack and abduction was carried out. Gwen Ifill has an update.