The Nigerian army has defeated Boko Haram in the Sambisa forest, one of the jihadists' last remaining strongholds, President Muhammadu Buhari said Saturday.

A campaign lasting for months in the 1,300 square-kilometre forest in northeastern Borno state led to the "final crushing of Boko Haram terrorists in their last enclave in Sambisa Forest", Buhari said in a statement.