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Security forces defend their headquarters against attacks by Islamic State extremists during sand storm in the eastern part of Ramadi, the capital of Anbar province, 115 kilometers (70 miles) west of Baghdad, Iraq, Thursday, May 14, 2015. Islamic State extremists tend to take advantage of bad weather when they attack Iraqi security forces positions, an Iraqi officer said. (AP Photo)
Security forces defend their headquarters against attacks by Islamic State extremists during sand storm in the eastern part of Ramadi, the capital of Anbar province, 115 kilometers (70 miles) west of Baghdad, Iraq, Thursday, May 14, 2015. Islamic State extremists tend to take advantage of bad weather when they attack Iraqi security forces positions, an Iraqi officer said. (AP Photo)

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    Critical Iraqi city Ramadi under assault from ISIS

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Critical Iraqi city Ramadi under assault from ISIS

Iraqi forces are doing battle with ISIS over the key city of Ramadi. CNN's Jim Sciutto explains its importance.

Critical Iraqi city Ramadi under assault from ISIS

Iraqi forces are doing battle with ISIS over the key city of Ramadi. CNN's Jim Sciutto explains its importance.