(BBC) World powers have agreed to seek a nationwide "cessation of hostilities" in Syria to begin in a week's time, after talks in Germany.
The halt will not apply to the battle against jihadist groups Islamic State (IS) and al-Nusra Front.
Ministers from the International Syria Support Group also agreed to accelerate and expand aid deliveries.
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The announcement comes as the Syrian army, backed by Russian air strikes, advances in Aleppo province.
The move threatens to encircle tens of thousands of civilians in rebel-held parts of the major city of Aleppo.