Alison Meuse

More than 100 people, including 68 children, were killed in a suicide attack on Saturday in rebel-held northwestern Syria. The Syrian Observatory for Human Rights says the vast majority of the victims were families evacuating from two Shiite villages, Fuaa and Kefraya, long besieged by rebels. They had been promised safe passage out of rebel-held territory, as part of a reciprocal deal to evacuate two besieged pro-rebel towns, Madaya and Zabadani, on the opposite end of the country.

In the early hours of Friday morning, the U.S. struck a Syrian airbase in retaliation for an alleged chemical weapons attack on Tuesday by Syrian government forces in the town of Khan Shaykhun.

The Organization for the Prohibition of Chemical Weapons says it's still establishing the facts behind the deaths of dozens of people. Syrians on the ground have mixed feelings about what the U.S. strikes might mean for their future.

For Syrian activist Samer al-Hussein, Tuesday morning started much like any other.

"We woke up," he says, "as usual, to the sounds of warplanes that barely ever leave the skies of Idlib province."

He got word from fellow opposition activists that new strikes had targeted a nearby town, Khan Shaykhun. The 28-year-old prepared to leave his wife and sons — a toddler and a newborn — and head to the scene.

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KELLY MCEVERS, HOST:

A United Nations report says both Russian-backed Syrian forces and rebel factions committed war crimes in the besieged eastern districts of Aleppo between July 21 and Dec. 22, 2016, when the city was recaptured by the government.