 On 3 December, ISIS launched an offensive in the direction of the Deir Ezzor military airbase.They reportedly managed to capture the al-Masemekeh Building after a suicide bomber detonated a car near it.The next day, ISIS reportedly advanced further and captured Al Mari'iyah village and also captured parts of the al-Jafra village, On 5 December, ISIS captured the al-Jafra village.