Originally posted by the Voice of America. Voice of America content is produced by the Voice of America, a United States federal government-sponsored entity, and is in the public domain. Iraqi Forces Enter Mosul by VOA News An elite group of Iraqi Special Forces has begun its assault on Mosul, pushing through heavy resistance as the troops breach the Islamic State held city's outskirts. Maj. Gen. Sami al-Aridi said troops had entered the Gojali neighborhood of Mosul Tuesday morning, where they encountered fierce fighting with Islamic State militants. He said IS fighters had erected concrete barriers throughout the city to try and stop the advance of Iraqi soldiers. The advance by Iraqi soldiers was preceded by heavy airstrikes on IS positions inside the Gojali neighborhood. The jihadists returned fire with guided anti-tank missiles and rocket propelled grenades. Breakthrough The breakthrough comes two weeks after a coalition of Iraqi and Kurdish forces, backed Shi'ite militia and U.S. airstrikes, launched the largest military operation in the country since 2003 to clear the city of IS fighters. On Monday, Iraqi Prime Minister Haider al-Abadi warned any remaining IS fighters in Mosul that his army is ready to close in on them "from every place." "They don't have an exit, they don't have an escape, they can only surrender," he said during an address on state television. "They can die or they can surrender." Obstacles ahead Analysts say the fighting ahead is likely to be more difficult in the coming weeks, in part because of the city's captive civilian population, and partly because civilians who have escaped say IS fighters have extensively rigged buildings and roadways in the city with explosives. According to the United Nations, up to a million people could become displaced as the fighting intensifies in the city. More than 17,900 people have already fled the city since the beginning of the operation.