Syria

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FILE - In this undated file image posted on a militant website on Tuesday, Jan. 14, 2014, which has been verified and is consistent with other AP reporting, fighters from the al-Qaida linked Islamic State group, march in Raqqa, Syria. The Islamic State group will likely take center stage when more than 140 heads of state of government convene for the U.N. General Assembly the week of Sept. 22. (AP Photo/File)

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A check point near the northeastern city of Qamishli, Syria. (AP Photo/Manu Brabo, File)

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In this Monday, Sept. 1, 2014, file photo, an Israeli soldier observes Syria's Quneitra province at an observation point on Mount Bental in the Israeli-controlled Golan Heights, overlooking the border with Syria. (AP Photo/Sebastian Scheiner, File)

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FILE - In this undated file photo posted on Monday, June 30, 2014 by the Raqqa Media Center of the Islamic State group, a militant extremist group, which has been verified and is consistent with other AP reporting, fighters from extremist Islamic State group parade in Raqqa, Syria. In staging airstrikes against Islamic State extremists in Syria, the U.S. may find itself in a confounding morass teeming with jihadis, rebel rivalries and sectarian hatred. (AP Photo/Raqqa Media Center of the Islamic State group, File)

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Posters depicting ISIL ambition in Syria and Iraq are displayed as Secretary of Defense Chuck Hagel and the Chairman of the Joint Chiefs of Staff Martin Dempsey testify concerning the Islamic State of Iraq and the Levant (ISIL) in front of the Senate Armed Services Committee on Capitol Hill, Washington, D.C., Tuesday, September 16, 2014. (Andrew Harnik/The Washington Times)

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Posters depicting ISIL ambition in Syria and Iraq are displayed as Secretary of Defense Chuck Hagel and the Chairman of the Joint Chiefs of Staff Martin Dempsey testify concerning the Islamic State of Iraq and the Levant (ISIL) in front of the Senate Armed Services Committee on Capitol Hill, Washington, D.C., Tuesday, September 16, 2014. (Andrew Harnik/The Washington Times)

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Secretary of Defense Chuck Hagel and the Chairman of the Joint Chiefs of Staff Martin Dempsey look at posters depicting ISIL ambition in Syria and Iraq as they testify concerning the Islamic State of Iraq and the Levant (ISIL) in front of the Senate Armed Services Committee on Capitol Hill, Washington, D.C., Tuesday, September 16, 2014. (Andrew Harnik/The Washington Times)

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Posters depicting ISIL ambition in Syria and Iraq are displayed as Secretary of Defense Chuck Hagel and the Chairman of the Joint Chiefs of Staff Martin Dempsey testify concerning the Islamic State of Iraq and the Levant (ISIL) in front of the Senate Armed Services Committee on Capitol Hill, Washington, D.C., Tuesday, September 16, 2014. (Andrew Harnik/The Washington Times)

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Posters depicting ISIL ambition in Syria and Iraq are displayed as Secretary of Defense Chuck Hagel, left, and the Chairman of the Joint Chiefs of Staff Martin Dempsey, right, testify concerning the Islamic State of Iraq and the Levant (ISIL) in front of the Senate Armed Services Committee on Capitol Hill, Washington, D.C., Tuesday, September 16, 2014. (Andrew Harnik/The Washington Times)

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Posters depicting ISIL ambition in Syria and Iraq are displayed as Secretary of Defense Chuck Hagel, left, and the Chairman of the Joint Chiefs of Staff Martin Dempsey, right, testify concerning the Islamic State of Iraq and the Levant (ISIL) in front of the Senate Armed Services Committee on Capitol Hill, Washington, D.C., Tuesday, September 16, 2014. (Andrew Harnik/The Washington Times)

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Posters depicting ISIL ambition in Syria and Iraq are displayed as Secretary of Defense Chuck Hagel and the Chairman of the Joint Chiefs of Staff Martin Dempsey, pictured, testify concerning the Islamic State of Iraq and the Levant (ISIL) in front of the Senate Armed Services Committee on Capitol Hill, Washington, D.C., Tuesday, September 16, 2014. (Andrew Harnik/The Washington Times)

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Secretary of Defense Chuck Hagel and the Chairman of the Joint Chiefs of Staff Martin Dempsey look at posters depicting ISIL ambition in Syria and Iraq as they testify concerning the Islamic State of Iraq and the Levant (ISIL) in front of the Senate Armed Services Committee on Capitol Hill, Washington, D.C., Tuesday, September 16, 2014. (Andrew Harnik/The Washington Times)

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Posters depicting ISIL ambition in Syria and Iraq are displayed as Secretary of Defense Chuck Hagel and the Chairman of the Joint Chiefs of Staff Martin Dempsey testify concerning the Islamic State of Iraq and the Levant (ISIL) in front of the Senate Armed Services Committee on Capitol Hill, Washington, D.C., Tuesday, September 16, 2014. (Andrew Harnik/The Washington Times)

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Posters depicting ISIL ambition in Syria and Iraq are displayed as Secretary of Defense Chuck Hagel and the Chairman of the Joint Chiefs of Staff Martin Dempsey testify concerning the Islamic State of Iraq and the Levant (ISIL) in front of the Senate Armed Services Committee on Capitol Hill, Washington, D.C., Tuesday, September 16, 2014. (Andrew Harnik/The Washington Times)

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Posters depicting ISIL ambition in Syria and Iraq are displayed as Secretary of Defense Chuck Hagel and the Chairman of the Joint Chiefs of Staff Martin Dempsey testify concerning the Islamic State of Iraq and the Levant (ISIL) in front of the Senate Armed Services Committee on Capitol Hill, Washington, D.C., Tuesday, September 16, 2014. (Andrew Harnik/The Washington Times)

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President Obama said Wednesday he had authorized U.S. airstrikes inside Syria for the first time, along with expanded strikes in Iraq, as part of "a steady, relentless effort" to root out Islamic State extremists. (AP Photo/Saul Loeb, Pool)

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In this undated file image posted by the Raqqa Media Center, a Syrian opposition group, on Monday, June 30, 2014, which has been verified and is consistent with other AP reporting, fighters from Islamic State group parade in Raqqa, Syria. (AP Photo/Raqqa Media Center, File)

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FILE - In this undated file image posted by the Raqqa Media Center, a Syrian opposition group, on Monday, June 30, 2014, which has been verified and is consistent with other AP reporting, fighters from the Islamic State group sit on a tank during a parade in Raqqa, Syria. The Islamic State group is often described as the most fearsome jihadi outfit of all: a global menace outweighing al-Qaida, with armies trembling before its advance. But while the group has been successful at seizing parts of Iraq and Syria, it is no unstoppable juggernaut. (AP Photo/Raqqa Media Center, File)

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Sen. Bill Nelson, Florida Democrat, is hammering out a legislative proposal to authorize U.S. military strikes on Islamic State targets within Syria. (associated press)