Israeli warplanes have bombed a military site near Damascus, the Associated Press reports citing the Syrian state news agency.
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The Holby City star, who had been visiting Barcelona, detailed the events of the attack on Twitter as they unfolded.
Searches are continuing for victims, with around 600 people still missing and 3,000 left homeless after the disaster.
The man who drove the van that ploughed into pedestrians killing 13 people was unharmed and is still on the run, police believe.