Activists in Syria's besieged city of Aleppo protest Tuesday against the United Nations for what they say is its failure to lift the siege of their rebel-held area. "Hunger better than humiliation," one banner read. "X the UN," another declared. Modar Shekho/AP hide caption

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Modar Shekho/AP

In this photo taken February 2016, children peer from a partially destroyed home in Aleppo, Syria. Alexander Kots/AP hide caption

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Alexander Kots/AP

'What Is Aleppo?' There's No Easy Answer

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A video released by the White Helmets, a team of volunteer rescue workers, shows men hosing down civilians after the reported chlorine gas attack Tuesday in Aleppo, Syria. White Helmets/Screenshot by NPR hide caption

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White Helmets/Screenshot by NPR

Abu Muhammed al-Adnani, spokesman for the Islamic State, has been killed in northern Syria, according to the IS semi-official news agency Amaq. He's shown here in an undated image provided by SITE Intel Group. AP hide caption

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A 5-year-old boy, identified in news reports as Omran Daqneesh, sits in an ambulance Wednesday after reportedly being pulled out of a building hit by an airstrike in Aleppo, Syria. Mahmoud Raslan/Anadolu Agency/Getty Images hide caption

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Mahmoud Raslan/Anadolu Agency/Getty Images

Wounded 5-year-old Omran Daqneesh sits alone in the back of the ambulance after he was injured during airstrikes targeting Aleppo, Syria, on Wednesday. Anadolu Agency/Getty Images hide caption

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Anadolu Agency/Getty Images

A 5-year-old boy, identified in news reports as Omran Daqneesh, sits in an ambulance Wednesday after reportedly being pulled out of a building hit by an airstrike in Aleppo, Syria. Mahmoud Raslan/Anadolu Agency/Getty Images hide caption

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Mahmoud Raslan/Anadolu Agency/Getty Images

In Syria, Underground Efforts To Train Doctors Amid Regime Attacks

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Syrian Civil Defense Force rescuer Khaled Omar Harrah after pulling a baby from a destroyed home in Aleppo. The moment was caught on video and gained international attention. The White Helmets/Screen shot by NPR hide caption

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The White Helmets/Screen shot by NPR

Smoke rises over Saif Al Dawla district in Aleppo, Syria, in 2012. Russia and the Syrian government say they will open humanitarian corridors in Aleppo and offer a way out for opposition fighters wanting to lay down their arms, Russian Defense Minister Sergei Shoigu said Thursday. Manu Brabo/AP hide caption

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Manu Brabo/AP

Children peer from a partially destroyed home in Aleppo, Syria in February. Syria's largest city used to be its economic locomotive, now it is has become an emblem of its stalemated civil war. Alexander Kots/AP hide caption

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Alexander Kots/AP