1: Irbil , Iraq ( CNN ) ISIS claimed it controlled part of Iraq 's largest oil refinery Sunday , posting images online that purported to show the storming of the facility , fierce clashes and plumes of smoke rising above the contested site . 2: It would n't be the first time that militants and Iraqi forces have battled over the refinery , a key strategic resource that has long been a lucrative target because the facility refines much of the fuel used by Iraqis domestically . 3: The refinery , Iraq 's largest , has long been a lucrative target for militants .
1: Iraq 's largest oil refinery 2: a lucrative target 3: The refinery , Iraq 's largest