Eight people have been treated for breathing difficulties at the scene of a chemical incident in Essex.
The East of England Ambulance Service says it has also taken a number of patients from Witham Leisure Park to Broomfield Hospital after being called at 11.44am on Saturday, March 18.
Two ambulances, two ambulance offices, two rapid response cars and the hazardous area response team are all attending.
Essex Fire and Rescue Service has also sent six crews.
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A windy evening, clear spells and a few blustery showers. Strongest winds are likely along coastal areas.
Around 170 officers and staff from Cambridgeshire police, were drafted in to manage the demonstration.