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

Firefighters combat a blaze on April 29, after regime helicopters targeted a medical center in an opposition-controlled region of Aleppo, Syria. Anadolu Agency/Getty Images hide caption

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Anadolu Agency/Getty Images

A Cease-Fire In Name Alone

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Belkiz Halip and her children Eye (left) and Zehra fled bombing in Aleppo to a tent city close to the Bab al-Salam crossing on the Turkish-Syrian border. Anadolu Agency/Getty Images hide caption

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Anadolu Agency/Getty Images

A Syrian man is among the thousands who have fled the fighting in and around the northern city of Aleppo. Thousands of Syrians have gathered at the Bab al-Salam crossing in an attempt to enter Turkey, which has kept the gate closed. Syrian government troops, assisted by Russian airstrikes, have been making gains in the Aleppo area. Anadolu Agency/Getty Images hide caption

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Anadolu Agency/Getty Images

A first responder in the rebel-held city of Aleppo carries a child who was wounded in a government airstrike on Sept. 16. Karam Al-Masri/AFP/Getty Images hide caption

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Karam Al-Masri/AFP/Getty Images

In Syria, Health Care Workers Are The Heroes — And The Targets

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Satellite photo made available by Amnesty International on Wednesday of the Jabal Badro area of Aleppo, Syria, before a ballistic missile strike on Feb. 18 that reportedly killed scores of residents. AP hide caption

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Robert Ford, the State Department's point man on Syria policy, appears before the Senate Foreign Relations Committee on April 11. Michael Reynolds/EPA /LANDOV hide caption

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Michael Reynolds/EPA /LANDOV