Yemenis walk past near oil tankers that were burnt during clashes between Shiite Houthi rebels and their opponents in the capital, Sanaa, in September. Saudi Arabia launched airstrikes this week to counter the Houthis' offensive. Mohammed Huwais/AFP/Getty Images hide caption

itoggle caption Mohammed Huwais/AFP/Getty Images

A Houthi Shiite fighter stands guard Thursday as people search for survivors under the rubble of houses destroyed by Saudi airstrikes near Sanaa Airport in Yemen. Hani Mohammed/AP hide caption

itoggle caption Hani Mohammed/AP

People examine the rubble following an air strike near the airport in Yemen's capital Sanaa on Thursday. Saudi Arabia said it carried out bombing raids in neighboring Yemen as Houthi rebels, allied with Iran, continued their offensive in the country. Yemen's president fled the country Wednesday and was reported to be in Saudi Arabia on Thursday. Khaled Abdullah/Reuters/Landov hide caption

itoggle caption Khaled Abdullah/Reuters/Landov

Supporters of Houthi Shiites, who took over the government of Yemen and installed a new committee to govern, dance with traditional daggers at a rally in support of the Houthis, at a sports stadium in Sanaa, Yemen, Saturday, Feb. 7, 2015. Hani Mohammed/AP hide caption

itoggle caption Hani Mohammed/AP

Houthi Shiite Yemeni carry coffins of fellow men killed during recent clashes with presidential guard forces, during their funeral procession in Sanaa, Yemen, on Friday. Hani Mohammed/AP hide caption

itoggle caption Hani Mohammed/AP

Shiite Houthi rebels chant slogans after taking over a government military compound in Yemen's capital, Sanaa, in September. The group forced the country's president to resign on Thursday, plunging Yemen into uncertainty. Hani Mohammed/AP hide caption

itoggle caption Hani Mohammed/AP

Female demonstrators hold up posters of Yemen's president during an August pro-government demonstration in Sanaa. The rebels took over the presidential palace on Tuesday. Mohammed Huwais/AFP/Getty Images hide caption

itoggle caption Mohammed Huwais/AFP/Getty Images

Houses of local residents are seen damaged in clashes that erupted between presidential guards and Shiite Houthi fighters in Sanaa, Yemen, on Tuesday. Hani Ali/Xinhua/Landov hide caption

itoggle caption Hani Ali/Xinhua/Landov

South African Pierre Korkie was killed in a failed rescue attempt along with American photojournalist Luke Somers. U.S. officials were reportedly unaware that Korkie was being held along with Somers nor that arrangements had already been made for his release. AP hide caption

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Luke Somers, 33, an American photojournalist who was kidnapped over a year ago by al-Qaida, poses for a picture during a parade marking the second anniversary of the revolution in Sanaa, Yemen. Hani Mohammed/AP hide caption

itoggle caption Hani Mohammed/AP