Syria yesterday demanded written guarantees that insurgents will stop fighting before it pulls back troops under the terms of a peace plan, casting additional doubt over a truce due to start this week.
Escalating violence has already raised questions about the ceasefire.
Opposition activists said dozens of people were killed and wounded yesterday when President Bashar al-Assad's loyalists shelled a rebel area near the border with Turkey.
UN-Arab League envoy Kofi Annan, seeking to end the conflict that has killed more than 9000 people in the past year, said the latest bloodshed violated the guarantees he had been given and urged Damascus to keep its promises.
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