In a speech in Damascus President Assad said "suffering is overwhelming Syrian land" and the "nation is for all and we must protect it".
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A defence ministry official reportedly said Russia had intensified its campaign in the last 24 hours, with 64 sorties hitting 55 targets.
Some patchy mist and fog overnight as the temperature's dip.
The actor joined hundreds of mourners at the funeral of the 30-year-old make up artist in the village of Cappawhite, Ireland.