Iraqi government forces have launched an offensive to liberate the western part of the city of Mosul from the so-called Islamic State. Hundreds of military vehicles, backed by air power, rolled across the desert towards IS positions early today. Iraqi forces retook several villages south of the city in the first hours of the operation, taking them within striking distance of Mosul airport. <br/><br/>Army Staff Lieutenant General Abdulamir Yarallah said in a statement that elite Rapid Response units captured the villages of Athbah and Al-Lazzagah – two villages south of Mosul airport. The offensive was formally announced by Iraqi Prime Minister Haider al-Abadi. Government forces retook the eastern side of the city, the last major IS stronghold in Iraq, last month. <br/><br/>The UN has voiced concern about civilians trapped there, amid reports that they could number up to 650,000. Leaflets warning residents of an imminent offensive were earlier dropped over the west of the city. Lieutenant General Stephen Townsend, the commander of the US-led coalition forces, said in a statement today, Mosul would be a tough fight for any army in the world.