The van was travelling close to Ford Prison in Lewes, East Sussex just before 11 am this morning.
The prisoner in the van was seriously injured and 4 people have been left trapped as fire crews try to cut them free.
Three people have currently been rescued with the others remaining trapped inside after the van was spun over.
One still trapped is believed to be a prisoner and the rest are prison staff.
A spokesperson for Sussex Police said: “Rescue and recovery work continues at the location (of the crash).”
It is unclear how the accident happened yet and whether the lorry driver suffered any injuries.
More to follow.
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