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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Wintry showers will continue to affect East Anglia on Sunday, elsewhere it should be largely dry. Some sunny intervals are likely.
The wintry weather is continuing across the Anglia region with sleet and snow in many areas. Here is a selection of pictures from viewers.
Cold with further wintry showers which may merge into longer periods of snow after midnight.