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Sun, 7 Sep 2014 16:42 PM

Riot policemen sit near their vehicle before clashes with followers of the Shi'ite Houthi movement along a main road leading to the airport in Sanaa September 7, 2014. Protesters from the Shi'ite Muslim group the Houthis cut off the road between the capital and Yemen's main airport while warplanes bombed Houthi rebel positions in the north on Sunday in a sharp escalation of weeks of tensions with the government. REUTERS/Khaled Abdullah (YEMEN)

Sun, 7 Sep 2014 16:33 PM

Kurdish peshmerga fighters rest in a shelter on the front line against the Islamic State, in Khazir near Mosul September 7, 2014. Islamic State launched a lightning advance through northern and central Iraq in June, declaring an Islamic caliphate. With the help of U.S. air strikes, Iraq's army and Kurdish forces have been able to push the fighters back from some areas. REUTERS/Azad Lashkari (IRAQ - Tags: CIVIL UNREST CONFLICT)

Sun, 7 Sep 2014 16:20 PM

Followers of the Shi'ite Houthi movement flee as riot police use tear gas to disperse them along a main road leading to the airport in Sanaa September 7, 2014. Protesters from the Shi'ite Muslim group the Houthis cut off the road between the capital and Yemen's main airport while warplanes bombed Houthi rebel positions in the north on Sunday in a sharp escalation of weeks of tensions with the government. REUTERS/Khaled Abdullah (YEMEN - Tags: POLITICS CIVIL UNREST)

Sun, 7 Sep 2014 16:16 PM

Shi'ite Houthis carry a fellow protester suffering from tear gas inhalation during clashes with riot police along the main road leading to the airport in Sanaa September 7, 2014. Protesters from the Shi'ite Muslim group the Houthis cut off the road between the capital and Yemen's main airport while warplanes bombed Houthi rebel positions in the north on Sunday in a sharp escalation of weeks of tensions with the government. REUTERS/Khaled Abdullah (YEMEN - Tags: POLITICS CIVIL UNREST)

Sun, 7 Sep 2014 16:13 PM

Shi'ite Houthis help a fellow protester suffering from tear gas inhalation during clashes with riot police along the main road leading to the airport in Sanaa September 7, 2014. Protesters from the Shi'ite Muslim group the Houthis cut off the road between the capital and Yemen's main airport while warplanes bombed Houthi rebel positions in the north on Sunday in a sharp escalation of weeks of tensions with the government. REUTERS/Khaled Abdullah (YEMEN - Tags: POLITICS CIVIL UNREST)

Sun, 7 Sep 2014 16:11 PM

Medics and people help a Houthi suffering from tear gas inhalation during clashes with riot police along the main road leading to the airport in Sanaa September 7, 2014. Protesters from the Shi'ite Muslim group the Houthis cut off the road between the capital and Yemen's main airport while warplanes bombed Houthi rebel positions in the north on Sunday in a sharp escalation of weeks of tensions with the government. REUTERS/Khaled Abdullah (YEMEN - Tags: POLITICS CIVIL UNREST)