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At least 50 children are thought to be among the dead.
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The attack by the Syrian government was on the rebel enclave of eastern Ghouta.
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The suburbs are near Damascus and host rebel groups.
Concerns are growing that Syria faces the worst humanitarian catastrophe of its seven-year civil war after more than 250 civilians were reportedly killed in airstrikes by forces loyal to Bashar al-Assad within two days.
Amnesty International said there were “flagrant war crimes” going on in eastern Ghouta, near the capital Damascus.