America's flying manned surveilllance missions to try to track down schoolgirls kidnapped by militants in Nigeria.
It's believed Boko Haram is holding more than 200 hostages in a forest in the northeast of the country.
The Nigerian government says it's 'considering all options' - after the Islamist militant group offered to free some of girls in return for the release of its prisoners.
Sister Maria Ugonna Igbo is from a similar school to the one the girls were taken from.
