Kofi Annan meets with Syria President Bashar Assad

As tanks reportedly attack rebels in Idlib, the former U.N. chief holds talks in a bid to head off what world leaders fear could become a full-fledged civil war.

A high-level peace envoy urged Syrian President Bashar Assad to take "concrete steps" to end the turmoil in his nation, the United Nations said Saturday, but a reported offensive against rebels in the country's rugged northwest highlighted the ferocity of the violence almost a year after the country's uprising began.

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