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FILE - In this undated file photo released by a militant website, which has been verified and is consistent with other AP reporting, militants of the Islamic State group hold up their weapons and wave flags on their vehicles in a convoy on a road leading to Iraq, while riding in Raqqa, Syria. Simultaneous attacks on the Islamic State-held city of Mosul in Iraq and Raqqa, the de facto IS capital across the border in eastern Syria, would make military sense: They would make it harder for the extremists to move reinforcements and deny them a safe haven. (Militant website via AP, File)
FILE - In this undated file photo released by a militant website, which has been verified and is consistent with other AP reporting, militants of the Islamic State group hold up their weapons and wave flags on their vehicles in a convoy on a road leading to Iraq, while riding in Raqqa, Syria. Simultaneous attacks on the Islamic State-held city of Mosul in Iraq and Raqqa, the de facto IS capital across the border in eastern Syria, would make military sense: They would make it harder for the extremists to move reinforcements and deny them a safe haven. (Militant website via AP, File)

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    Why Raqqa matters

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Why Raqqa matters

Raqqa became the most important of the ISIS Syrian holdings -- the first provincial capital it seized -- its administrative center and the city from which terror attacks against Europe are planned.

Why Raqqa matters

Raqqa became the most important of the ISIS Syrian holdings -- the first provincial capital it seized -- its administrative center and the city from which terror attacks against Europe are planned.