Mike Omeri, the director of the government's information agency, called the National Orientation Agency, said the government will "use whatever kind of action" it takes to free the girls. He also warned that a military operation, with foreign help, was possible. More pics after cut..

Brig. Gen. Chris Olukolade, Nigeria's top military spokesman, speaks during a press conference on the abducted school girls in Abuja, Nigeria, Monday, May 12, 2014. A Nigerian Islamic extremist leader says nearly 300 abducted schoolgirls will not be seen again until the government frees his detained fighters. A new video from Nigeria's homegrown Boko Haram terrorist network received Monday purports to show some of the girls and young women chanting Quranic verses in Arabic. The barefoot girls look frightened and sad and sit huddled together wearing gray Muslim veils. Some Christians among them say they have converted to Islam. (AP Photo/Sunday Alamba)
In this photo taken from video by Nigeria's Boko Haram terrorist network, Monday May 12, 2014 shows their leader Abubakar Shekau speaking to the camera. The new video purports to show dozens of abducted schoolgirls, covered in jihab and praying in Arabic. It is the first public sight of the girls since more than 300 were kidnapped from a northeastern school the night of April 14 exactly four weeks ago. (AP Photo)
French actresses and models pose in front of the Eiffel Tower holding placards saying: Bring back our girls, during a rally at the Trocadero, to show support for the release of the kidnapped girls in Nigeria in Paris, Tuesday May 13, 2014. A French official says Nigerian President Goodluck Jonathan has agreed to attend a security summit on Saturday in Paris to focus on the Boko Haram terrorist network, which abducted more than 300 schoolgirls in Nigeria last month. Signs center and left read, save the Nigerian schoolgirls. (AP Photo/Remy de la Mauviniere)