NINEVEH, IRAQ - OCTOBER 27: Smoke rises after Daesh torched Mishraq sulphur factory, about 30 kilometres south of Mosul, during an operation to retake Mosul, on October 27, 2016. Daesh have set sulphur stockpiles on fire to slow the advance on Mosul. ( Emrah Yorulmaz - Anadolu Agency )
NINEVEH, IRAQ - OCTOBER 27: Smoke rises after Daesh torched Mishraq sulphur factory, about 30 kilometres south of Mosul, during an operation to retake Mosul, on October 27, 2016. Daesh have set sulphur stockpiles on fire to slow the advance on Mosul. ( Emrah Yorulmaz - Anadolu Agency )
NINEVEH, IRAQ - OCTOBER 27: Sulphur hills are seen after Daesh torched Mishraq sulphur factory, about 30 kilometres south of Mosul, during an operation to retake Mosul, on October 27, 2016. Daesh have set sulphur stockpiles on fire to slow the advance on Mosul. ( Emrah Yorulmaz - Anadolu Agency )
NINEVEH, IRAQ - OCTOBER 27: Sulphur hills are seen after Daesh torched Mishraq sulphur factory, about 30 kilometres south of Mosul, during an operation to retake Mosul, on October 27, 2016. Daesh have set sulphur stockpiles on fire to slow the advance on Mosul. ( Emrah Yorulmaz - Anadolu Agency )