The Islamic State of Iraq and al-Sham (ISIS) has seized several parts of Iraq’s northern energy sector in what could be an attempt to hijack a portion of Iraq’s oil revenue stream. The Baiji refinery, Iraq’s largest, is now under the control of local tribes aligned with ISIS, according to refinery workers, two senior North Oil Company (NOC) officials, and a senior Interior Ministry official. Militants have caused no damage and instructed workers to keep the facility online. “ISIS left all …