Saudi Arabia's army fires artillery shells toward Houthi rebels along the Saudi border with Yemen on April 15. Outside Saudi Arabia, many are critical of the military campaign and question whether it will succeed, but it is popular inside the kingdom. STR /Reuters/Landov hide caption

itoggle caption STR /Reuters/Landov

Militants loyal to Yemen's President Abed Rabbo Mansour Hadi take their positions in Taiz, Yemen, late last month after at least 45 people were killed in north Yemen after an airstrike hit a camp for internally displaced people. Anees Mahyoub/UPI/Landov hide caption

itoggle caption Anees Mahyoub/UPI/Landov

A "getaway selfie," as Mokhtar Alkhanshali calls it: Alkhanshali (left) makes his way across the Red Sea with this boat driver — and without navigation equipment. Mokhtar Alkhanshali hide caption

itoggle caption Mokhtar Alkhanshali

These kids are Yemenis without a home. Fighting between government and rebel forces caused their families to flee to a refugee camp in Aden, where the youngsters find time for fun. Stephanie Sinclair/VII hide caption

itoggle caption Stephanie Sinclair/VII

Smoke and flames reportedly from Shiite Houthi rebels' camps rise over part of the Yemeni capital, Sanaa, on Monday. Fierce fighting has left people trapped, including U.S. citizens. Mohammed Huwais/AFP/Getty Images hide caption

itoggle caption Mohammed Huwais/AFP/Getty Images

Houthi fighters gather in the Yemeni city of Aden on Thursday. The Shiite rebels and their allies seized the presidential palace in this southern coastal city. Wael Qubady/AP hide caption

itoggle caption Wael Qubady/AP

Pakistani activists march in support of the Saudi government at a protest in Quetta on March 30, 2015. Pakistan is the latest country to join a Saudi-led coalition fighting Houthi rebels in Yemen. BANARAS KHAN/AFP/Getty Images hide caption

itoggle caption BANARAS KHAN/AFP/Getty Images

Secretary-general of the League of Arab States Nabil Elaraby (left) and Egyptian Foreign Minister Sameh Shukri attend a news conference after the closing session of the Arab League Summit in Sharm el-Sheikh, Egypt, on Sunday. The 22-nation body agreed in principle to establishing a regional security force. Cui Xinyu/Xinhua/Landov hide caption

itoggle caption Cui Xinyu/Xinhua/Landov

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