Manned US aircraft were flying over Nigeria on Tuesday, searching for over 200 schoolgirls abducted by Boko Haram militants after Abuja dismissed a prisoner-swap offer from the militants

Manned US aircraft were flying over Nigeria on Tuesday, searching for over 200 schoolgirls abducted by Boko Haram militants after Abuja dismissed a prisoner-swap offer from the militants.
  
"We have shared commercial satellite imagery with the Nigerians and are flying manned ISR (intelligence, surveillance and reconnaissance) assets over Nigeria with the government's permission," a senior US administration official said Monday.
  
The official declined to be named, and it was not immediately clear what kind of aircrafts were being deployed, nor where they were based. Boko Haram's leader said in a new video obtained by AFP Monday that the girls, whose abduction has sparked global outrage, would only be released if the government freed militant fighters from custody.
  
Abubakar Shekau made the claim in a 27-minute video, which apparently showed about 130 of the teenagers who were snatched from their school in the remote northeastern town of Chibok nearly a month ago.
  
State Department spokeswoman Jen Psaki said US intelligence experts were "combing through every detail of the video for clues that might help ongoing efforts to secure the release of the girls."