Three prisoners who absconded on Friday morning remain at large, police said.
Edward Braime, Frederick Gray and Jonathan Dawson absconded from HMP North Sea Camp in Boston, Lincolnshire, between 2.30am and 6am on Friday.
A Lincolnshire Police spokesman said they remained at large.
Since their disappearance on Friday police have been carrying out inquiries and searches both locally and further afield in areas the men are familiar with.
The force previously said it is not known if they are together or whether they have separated.
Braime is 39 and from Devon. An unconfirmed report suggests he was last seen wearing military type boots, black jeans, a sleeveless leather jacket and a black coat with an orange lining.
Dawson, aged 31, from Nottingham, is described as white, 5ft 6-7ins, of medium build with short brown cropped hair
Gray, 31, from Lincoln, is also described as white, 5ft 10ins, of medium build, with light brown, short receding hair.
Police warned members of the public not to approach the men and to contact police immediately with any sightings.
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