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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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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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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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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Syrians carry a large revolution flag and chant slogans during a protest in Aleppo, Syria, where young people and children sang songs against President Bashar Assad and the Syrian regime, Dec. 21, 2012. Virginie Nguyen Hoang/AP hide caption

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Three suicide car bombings rocked the center of Aleppo in northern Syria on Wednesday, killing dozens and causing extensive damage. SANA/Xinhua /Landov hide caption

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Turkey Fires On Northern Syria In Response To Rocket Attack
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One-year-old Hassan was discovered in the rubble of an apartment building in Aleppo, Syria, giving his rescuers a moment of hope on a sad day. His parents were killed by the helicopter strike. Global Post hide caption

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Anti-Assad fighters stood atop a captured army tank on Wednesday in the village of Anadan, about 4 miles northwest of Aleppo. Ahmad Gharabli /AFP/Getty Images hide caption

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From 'Morning Edition': Anthony Kuhn, in Beirut, talks with Steve Inskeep
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Free Syrian Army fighters are seen in the Syrian town of Azaz, some 20 miles north of Aleppo, on Tuesday. Turkpix/AP hide caption

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