Baghdad ( CNN ) Iraq 's military abandoned a strategically important base in Anbar province after heavy fighting with ISIS militants , provincial security force sources told CNN on Monday . The base outside the city of Hit was one of the Shiite-led government 's few remaining military outposts in Anbar , a predominantly Sunni province that has increasingly fallen under ISIS control . It is a key control point for roads running through the region . The Iraqi military still controls the Ayn al-Asad military base , which helps defend Iraq 's second-largest dam and the provincial capital of Ramadi . Despite airstrikes by the U.S. and its allies over the weekend , reports suggest ISIS has continued to gain ground and has encircled Haditha , the last large town in Anbar not yet in the militant group 's hands . Sabah Al-Karhout , president of the Anbar Provincial Council , said Sunday that ISIS , the self-proclaimed Islamic State , had control of about 80 % of the province . Should all of Anbar fall , the Sunni extremists would rule from the perimeter of Iraq 's capital to Raqqa in Syria , at least , according to the provincial council 's deputy head , Falleh al-Issawi . ISIS would control a swath 350 miles ( 563 kilometers ) long . Anbar leaders on Saturday appealed for U.S. ground forces to help them fight ISIS , but Baghdad said it had not received any official request . The Iraqi government has been adamant that it does not want U.S. forces on the ground , and President Barack Obama has not shown any intent to deploy any . Besieged Kobani . Meanwhile in Syria , fighting continues in the key Kurdish border city of Kobani , which ISIS has been trying to seize for weeks . Monday has been one most violent days since ISIS launched its assault , with sounds of fierce fighting , including gunfire and explosions , CNN staff on the Syria-Turkey border said . CNN 's Nick Paton Walsh described seeing a mushroom cloud rising about 100 meters ( nearly 330 feet ) above the city in an area targeted by at least four blasts , generally after the sound of jets overhead . `` However , it remains unclear who is gaining the upper hand , '' Walsh said . `` Distribution of the airstrikes does not immediately suggest the Kurds are retaking the center so far . '' Hunter : Terrorists crossing into U.S. -- but maybe not ISIS . The U.S. military said it and partner nations had attacked ISIS in Syria on Sunday and Monday , launching four airstrikes southwest of Kobani , three northeast of the city and one northwest of Raqqa . `` Fighter aircraft from the Kingdom of Saudi Arabia participated in these airstrikes . All aircraft exited the strike areas safely , '' the U.S. military said in a statement . A fighter from the Kurdish People 's Protection Unit , or YPG , told CNN 's Arwa Damon that the battle was focusing on the main border crossing into Turkey . If ISIS took control , he said , `` it 's over . '' Oil and crime make ISIS rich . The fighter said the Kurdish fighters had pushed back an attempted advance by ISIS on Monday morning but that it would be `` impossible '' for them to hold their ground if current conditions continued . U.S. national security adviser Susan Rice said Sunday that Turkey had agreed to allow the United States and its partners to use bases and territory to train . `` They have said that their facilities inside Turkey can be used by coalition forces , American and otherwise , to engage in activities inside Iraq and Syria , '' Rice told NBC 's `` Meet the Press . '' `` That 's a new commitment and one that we very much welcome , '' she said . CNN 's Kareem Khadder contributed to this report .
Iraq 's military leaves an important military base in Anbar province to ISIS , sources say . The U.S. is sending a small number of special forces advisers and trainers to help Iraqi troops retake the city from ISIS militants. CNN team on the Turkey-Syria border describe fierce fighting for the city of Kobani . A Kurdish fighter said it would be `` impossible '' to hold ground if current conditions continued .