On 4June 2014, the Islamic State of Iraq and the Levant (ISIL) and its allies attacked Mosul launching their northern Iraq offensive. The following day, they started the Salahuddin campaign in Saladin. ISIL and its allies captured Mosul on 10June 2014. after a six-day battle. When the city fell, there were reports that the group was advancing from Mosul to Kirkuk. After capturing the city, the group freed nearly 1,000 prisoners. On 11June, ISIL and its allies also started the siege of Amirli.