Summary
At least 23 Syrian civilians were killed Saturday in airstrikes on a rebel-held town outside Damascus, activists said.
Elsewhere, ISIS freed 37 Syrian Christians who were among more than 200 people kidnapped in February, an NGO said.
ISIS freed a group of Assyrian Christians who had been taken hostage in northeastern Syria, an NGO said.
The former hostages were among a group of 220 Assyrians captured by ISIS when they overran parts of the region in February.
Assyrians numbered about 30,000 among Syria's 1.2 million Christians before the country's conflict began.
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