article_snippet: The Twitter messages made no mention  of military operations in Sambisa Forest, where Nigeria's home-grown Islamic extremist group is believed to have several camps.
article_snippet: Sambisa Forest starts about 20 miles from Gwoza town, which is 80 miles southeast of Maiduguri - the Borno state capital state and Boko Haram's birthplace.
article_snippet: Sambisa Forest is where extremists first took nearly 300 schoolgirls kidnapped from a boarding school in Chibok almost a year ago.