Batches of inmates will be transferred from Bedford jail "throughout the day" following Sunday's riot, a prison official has said.
The first prisoners were taken away late on Sunday night after the disturbance was resolved, she added.
The Prison Service is investigating the cause of the riot which took police and specialist guards six hours to get under control.
Up to 200 inmates were thought to have been involved in the incident at the Category B facility, which was "successfully resolved" at around 11.30pm.
Private contractor trucks waited outside the compound early on Monday morning, flanked by police vehicles, including a dog unit.
Several police vans marked as carrying chemicals including "irritants", "flammable liquid" and "compressed gas" also lined up outside the jail walls.
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A coach driver arrested on suspicion of causing death by dangerous driving after a fatal crash on the M1 has been released on bail.
Three men travelling in an Audi A3 died when their car was was involved in a collision with a coach on the hard shoulder of the motorway early on Saturday morning.
The victims of the crash included the driver, a man in his 50s from London, and two men in their 20s who were returning to their Buckinghamshire homes following a night out in London.
A fourth passenger, also in his 20s, remains in a critical but stable condition in hospital following surgery.
Bedfordshire Police are appealing for witnesses to a crash on the M1 this morning in which three men died. A coach driver was arrested after the incident and was taken to Luton police station.
Click below to watch Sarah Beecroft's report.
The driver of a coach involved in a fatal collision with a car on the M1 has been arrested, police say.
The crash occurred on the northbound carriageway of the M1 in Bedfordshire, killing three men in the stationary car.
A fourth man who was in the car remains in hospital with serious injuries, while none on board the coach were said to be hurt.
The coach driver is currently being interviewed in Luton, with Bedfordshire Police appealing for witnesses.
Three men killed in a traffic collision on the M1 were all travelling in a car that had stopped on the hard shoulder, police said.
A double-decker coach collided with the car near Flitwick in Bedfordshire.
No one on the coach was hurt in the crash at about 6.45am, but a fourth occupant of the car was taken to Oxford's John Radcliffe Hospital with serious injuries.
A police spokesman said officers were locating and liaising with next-of-kin and had launched a full collision investigation.