As the civil war veers toward what the UN’s peace envoy called a decisive moment, grisly details from the scene of a massacre have prompted Canada and several other countries to expel Syrian diplomats.

“We are at a tipping point,” former UN secretary-general Kofi Annan said, as he emerged on Tuesday from an emergency meeting with Syrian President Bashar al-Assad. Mr. Annan had been briefed earlier in the day by UN investigators about what appears to be the most flagrant violation so far of the peace plan he negotiated almost two months ago: the slaughter of more than 100 people, almost half of them children.

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