Subscribe to BBC News / bbcnews The BBC has heard evidence that Islamic State militants in northern Iraq have captured more than 3,000 women and children from the Yazidi minority group. The few who have managed to escape say Islamic State fighters are trafficking women and girls for sex. Yolande Knell, has gained rare access to some of those who've escaped. Subscribe to BBC News HERE http://bit.ly/1rbfUog Check out our website: http://www.bbc.com/news Facebook: / bbcworldnews Twitter: / bbcworld Instagram: / bbcnews