The East of England Ambulance service says 2 patients have been seriously injured in the A1 coach crash at Diddington.
It says they were taken to Addenbrooke's Hospital while a further eleven patients were taken to Hinchingbrooke Hospital with minor injuries.
The trust sent five ambulance crews and three rapid response vehicles to the scene.
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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.
Cambridgeshire police have been criticised by a coroner over the handling of the death of a pensioner in her home in Wisbech.