Two criminals have gone on the run from an open prison, taking the number of inmates to abscond from the facility to four in five days.
On Friday Marcus Brotherson, 27, and Jordan Hall, 24, disappeared from HMP Sudbury in Derbyshire.
Earlier this week two other prisoners absconded from the Category D jail.
The Prison Officer's Association (POA) said their disappearance did not come as a surprise and showed the regime in open prisons was "broken".
Brotherson was convicted for robbery and sentenced to four years in November 2012 and Hall was handed an indeterminate sentence for grievous bodily harm in 2008.
Derbyshire Police said the last known addresses for both men was in Birmingham and it is not clear whether they left together.
Missing since 1992
Two days earlier, Michael McCarthy, 24, who was jailed for three years for wounding with intent, absconded from the prison.
On Monday, Andrew Hudson, 38, who has convictions for burglary and robbery, also disappeared.
Figures obtained by the Press Association from the force revealed 28 prisoners are currently missing from the prison.
They include a number who have a history of violence, while one has been on the run for more than 20 years after being allowed out in 1992.
The revelations come amid a spate of inmates going on the run.
In the most high-profile case Michael Wheatley, known as "Skullcracker", carried out a raid on a building society in May while on the run from HMP Standford Hill in Kent.
Glyn Travis, spokesman for the POA, said: "Our view is the level of absconds doesn't surprise us.
"This is another example of how the system is broken and needs fixing.
"We keep telling ministers that they've been sending the wrong type of prisoner to open conditions for years."
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