The council voted in favour of a resolution calling on rights investigators to "urgently conduct a comprehensive and independent inquiry into recent events in Eastern Ghouta."
With 29 votes in favour, 14 abstentions and four opposed, the UN's top rights body also demanded immediate humanitarian access to the area where 400,000 residents have lived under siege from the regime since 2013 and face severe food and medicine shortages.
The United Nations said Sunday it planned to deliver desperately needed humanitarian assistance to the enclave on Monday with a convoy of "46 truckloads of health and nutrition supplies, along with food for 27,500 people in need".
"The UN and partners are ready to go as soon as all the necessarily elements are in place for us to do so," Jens Laerke, spokesman for the UN humanitarian agency OCHA, told AFP today.
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He added, however, that he did not yet have confirmation that that was the case.
The Syrian Observatory for Human Rights said barrel bombs -- crude, improvised munitions that cause indiscriminate damage -- were used, including on the town of Hammuriyeh, where 10 people were killed.
According to Rami Abdel Rahman, the head of the Britain-based Observatory, at least 166 were children.
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