Thick black smoke billowing from oil wells northeast of the city of Tikrit is obstructing Shi'ite militiamen and Iraqi soldiers attempts to drive ISIS from the Sunni Muslim city after militants set them on fire. Reuters reports a witness and a military source said Islamic State fighters ignited the fire at the Ajil oil field to shield themselves from attack by Iraqi military helicopters. As we noted previously, the battle for Tikrit is key as it will determine whether and how fast the Iraqi forces can advance further north and attempt to win back Mosul, the biggest city under Islamic State rule.

As Reuters reports,
Islamic State militants have set fire to oil wells northeast of the city of Tikrit to obstruct an assault by Shi'ite militiamen and Iraqi soldiers trying to drive them from the Sunni Muslim city and surrounding towns, a witness said.
