Hundreds of hostages, mostly children and women, who were held captive for months or years by Boko Haram extremists in northeastern Nigeria have been rescued from a forest enclave and handed over to authorities, the army said. The 350 hostages had been held in the Sambisa Forest, a hideout for the extremist group which launched an insurgency in 2009, Maj. Gen. Ken Chigbu, a senior Nigerian army officer, said late Monday while presenting them to authorities in Borno, where the forest is.