Essex Police have withdrawn their advice to residents to stay indoors after an explosion at a chemical plant in West Thurrock this evening.
A spokeswoman said the chemical smell had dissipated and any danger had passed.
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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.