Iraq forces launch assault on west Mosul U.S.-backed Iraqi forces have launched an offensive to retake western Mosul, the last major stronghold of so-called Islamic State (IS) in Iraq Mosul IRAQ Western Mosul: About 650,000 civilians thought to be stranded Mosul International Airport: IS has carved wide trenches, leaving no paved area usable for aircraft Abu Saif: Hilltop village overlooking western half of city First objectives are Abu Saif, military base, and airport al Ghazali military base All five bridges spanning Tigris destroyed IRAQI FORCES CONTROL ISLAMIC STATE CONTROL OLD CITY 2km 1.25 miles Great Mosque Government centre IS barricades Muaskar Tigris City limits Sources: Institute for the Study of War, Stratfor, Wire agencies Picture: Google Earth