A multinational force freed 900 hostages held by Nigeria's Boko Haram extremists, killed more than 100 fighters and arrested 100 others last week, Cameroon's government spokesman said Wednesday.<br />Troops also arrested 100 fighters, including a group leader, from Boko Haram's strongholds in the Sambisa Forest, which straddles northeastern Nigeria and Cameroon, and in the Lake Chad area, Bakary said.<br />Boko Haram's 6-year-old Islamic uprising has killed an estimated 20,000 people and driven 2.3 million from their homes, according to Amnesty International and the United Nations.<br />Two teen female suicide bombers detonated explosives late Tuesday in the north Cameroon town Waza, killing six people, Cameroon's Far North province governor, Midjiyawa Bakary, said Wednesday.
