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 Begin Push Into Western Mosul by Associated Press HAMAM AL-ALIL, IRAQ -- U.S.-backed Iraqi forces launched a large-scale military operation Sunday to dislodge Islamic State militants from the western half of Mosul city, a battle that is expected to be prolonged and difficult because of a densely packed civilian population and older, narrower streets. In a briefed televised speech on state TV, Iraqi Prime Minister Haider al-Abadi announced the start of the operation, saying the government forces were moving to "liberate the people of Mosul from Daesh oppression and terrorism forever," using the Arabic acronym for IS. Al-Abadi called on security forces to deal with civilians properly and respect human rights. Smoke rises from clashes as Iraqi security forces engage in a battle with Islamic State militants in south of Mosul, Iraq, Feb. 19, 2017. Plumes of smoke were rising into the sky early Sunday morning as U.S.-led coalition jets struck militant positions southwest of Mosul and militarized police fired artillery toward the city. Heavily armed police units were getting ready to move north with their armored vehicles from a base just southwest of the city. "This is zero hour and we are going to end this war, God willing," said Mahmoud Mansour, a police officer, as he prepared to move out. Members of the Iraqi rapid response forces fire a missile toward Islamic State militants during a battle in south of Mosul, Iraq, Feb. 19, 2017. Southern villages first The immediate objective of the operation was to take the villages on the southern outskirts of Mosul airport, a police spokesman told The Associated Press. The officer spoke on condition of anonymity in line with standard procedures. Police units quickly moved into the village of Athba about 4 kilometers (3 miles) southwest of the city's airport, encountering only light resistance, according to an AP reporter on the scene.Separately, the army's 9th armored division moved into the village of Bakhira, also southwest of the city, the Iraqi Ministry of Defense said. UN: Civilians trapped, at risk Shortly after the announcement, the United Nations warned that hundreds of thousands of civilians trapped inside their houses are at extreme risk with dwindling fuel and food supplies and scare drinking water and electricity. "The situation is distressing. People, right now, are in trouble," Lise Grande, Humanitarian Coordinator for Iraq, said in a statement. "We are hearing reports of parents struggling to feed their children and to heat their homes," Grande said. Citing informants from inside the western side, the U.N. said nearly half of all food shops were closed and bakeries had shut down because of a lack of fuel and an inability to purchase costly flour. Prices of kerosene and cooking gas have skyrocketed, and many of the most destitute families are burning wood, furniture, plastic or garbage for cooking and heating. "Children and their families are starting to face critical shortages of safe drinking water," Peter Hawkins, UNICEF Representative in Iraq, was quoted as saying in the statement. "Three out of five people now depend on untreated water from wells for cooking and drinking as water systems and treatment plants have been damaged by fighting or run out of chlorine." The humanitarian agencies were gearing up to aid 250,000 to 400,000 civilians who may flee because of the fighting, the statement said. The U.N. estimates that about 750,000 civilians may be left in western Mosul. US commander praises Iraqis The Commander of Combined Joint Task Force Operation Inherent Resolve, Lt. Gen. Stephen Townsend, hailed the Iraqi forces in a statement as an "increasingly capable, formidable, and professional force." "Mosul would be a tough fight for any army in the world, and the Iraqi forces have risen to the challenge," Townsend said. "They have taken the fight to the enemy and sacrificed their blood for the people of Iraq and the rest of the world." Western Mosul tougher fight Eastern Mosul was retaken from IS by Iraqi forces last month after a 100-day battle, but the west of the city remains in the hands of the extremists. Unlike the east, much of the west is composed of old houses forming narrow alleyways, making the use of armored vehicles more difficult and promising a tougher fight. Iraqi special operations forces, regular army and federal police units are taking part in the offensive along with government-sanctioned paramilitary forces, made up mainly of Shiite militias, operating on the city's outskirts. According to the United Nations estimate, about 750,000 civilians may be left in the western half of Mosul and humanitarian conditions are grim, with stocks of food, fuel and water running low. Mosul, Iraq's second-largest city and the last IS urban stronghold in the country, fell into the hands of the extremists in the summer of 2014, when the group captured large swaths of northern and western Iraq.