NEW : Dam is in the hands of Kurdish forces , not Syria , an official says . There has been fierce fighting in the Kurdish town of Sinjar , close to the Islamic State , a source says . Iraqi fighters are engaged in house-to-house battle with ISIS , source says . Sinjar fell to ISIS fighters over weekend , police say .
NEW : Dam is in the hands of Kurdish forces , not the Islamic State , an official says . There has been fierce fighting in the Iraqi town of Sinjar , close to Syria , a source says . Kurdish fighters are engaged in house-to-house battle with Islamic State , source says . Sinjar fell to ISIS fighters over weekend , police say .