Residents living close to the Perkins site in Peterborough are being urged to stay indoors while a controlled explosion is carried out on an unstable chemical.
The alert was raised at 1:30 this morning and staff were evacuated. A 500 metre cordon has been put up around the area. The controlled explosion is due to happen in the next half hour.
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A driver got into a spot of trouble yesterday when his car got stuck at an exact 90 degree angle between two barriers.
After a mostly dry start with some sunny spells, but thickening cloud and scattered showers will spread from the west later.
The region is still recovering after a battering by winds of up to 75 miles an hour and the disruption is set to continue until tomorrow.