Not sure how reliable this is... but for what it's worth:
Chibok: American Marines locate abducted girls in Sambisa forest - Vanguard
There were indications yesterday that the 230 female students abducted by Boko Haram terrorists from the Government Girls’ Secondary School, GGSS, Chibok, Borno State, have been sited at the Sambisa Forest in Borno State, by the Special Forces of the United States Marines.
The girls who were abducted on April 14, were part of the 250 students boarded at the school for the West African School Certificate, WASC/ Senior Secondary School Certificate, SSSC, examinations, triggering world-wide condemnations.
This was even as more US military officials arrived Nigeria yesterday to join local officials in the search for nearly 300 school girls taken captives by the Islamist extremist group, Boko Haram, the US Secretary of State John Kerry, and the defence department, Pentagon, said.