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Sunday Alamba, Associated Press
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.

ABUJA, Nigeria — A Nigerian government official said "all options are open" in the search for missing schoolgirls that's now being actively supported by U.S. surveillance and reconnaissance aircraft.

Boko Haram, the militant group that is holding some 276 female students kidnapped , says in a new video that the girls will only be freed after the government releases jailed militants.

The group, which wants to impose Islamic law on Nigeria, has killed more than 1,500 people this year in a campaign of bombings and massacres. Boko Haram's kidnapping of schoolgirls at a boarding school in northeast Nigeria last month has focused international attention on the extremist group amid outrage that most of the girls have not been rescued.

Nigeria's government, which has repeatedly denied allegations that was slow to respond to the mass abduction, had initially suggested there would be no negotiations with Boko Haram. Now it appears that stance may be relaxed.

Mike Omri, the director of Nigeria's National Orientation Agency, said late Monday that the government will "use whatever kind of action" it takes to free the girls.

"At the moment, because all options are open we are interacting with experts, military and intelligence experts from other parts of the world," he said. "So these are part of the options that are available to us and many more."

The White House said Monday that the U.S. team assisting is made up of nearly 30 people drawn from the State and Defense departments, as well as the FBI, including 10 Defense Department planners who were already in Nigeria and were redirected to assist the government.

Another seven Defense Department personnel were sent to Nigeria from AFRICOM, the U.S. Africa Command based in Germany, said White House spokesman Jay Carney.

The U.S. is also sharing commercial satellite imagery with the Nigerian government, a senior U.S. official told The Associated Press on Monday.