The Amiri Red Sea was one of many boats ferrying refugees, including some Americans, escaping fighting in Yemen to nearby Djibouti, across the Gulf. Gregory Warner/NPR hide caption

itoggle caption Gregory Warner/NPR

Gunmen loyal to former Yemeni President Ali Abdullah Saleh, stand amid the ruin of Saleh's residence following an airstrike carried out by the Saudi-led alliance in the capital, Sana, on Sunday. Yahya Arhab/EPA/Landov hide caption

itoggle caption Yahya Arhab/EPA/Landov

Hassan Farid, 23, was a medical resident at a big hospital in Yemen and is the son of a judge. It can be difficult and expensive to flee Yemen, and educated professionals are among the refugees who have reached the nearby African nation of Djibouti. Gregory Warner/NPR hide caption

itoggle caption Gregory Warner/NPR

An airport official walks past a military aircraft destroyed by Saudi-led airstrikes, at the Sanaa International airport in Yemen on Tuesday. Destroyed runways prevent aid from being delivered. Hani Mohammed/AP hide caption

itoggle caption Hani Mohammed/AP

Supporters of the Shiite Houthi movement brandish weapons as they take part in a demonstration in Yemen's capital of Sanaa on Thursday, protesting the Saudi-led military "Decisive Storm" air campaign. Mohammed Huwais/AFP/Getty Images hide caption

itoggle caption Mohammed Huwais/AFP/Getty Images

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