Overall, the performance of prisons appears to have worsened, with the MoJ naming 10 in England and Wales as causing "serious concern".
Of these, a record 7,159 were attacks on staff - equivalent to 20 every day.
"They are not culpable and may be unaware that they have not completed their sentence or have outstanding warrant", it said.
Prisons across England and wales saw 26,643 assaults in the year to March 2017, including a record 7,159 attacks on prison staff - equivalent to nearly 20 a day.
Another 15 prisoners escaped from custody - four from prisons, eight from "contractor escort", and three from National Offender Management Service escort, but none involving the most risky category of prisoner.
A record number of prisoners were let free in error previous year, the government revealed today.
A prisoner is officially classed as having been released in error if they are wrongly discharged from an establishment or court when they should have remained in custody.
Campaigners and watchdogs have issued a catalogue of warnings about the state of prisons as safety measures have deteriorated.
A lack of safety in prisons was highlighted by two high-profile riots a year ago.
Data released by the Ministry of Justice will provide the latest numbers on deaths, self-harm and assaults in prisons.
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Around 14 per cent of all assaults were classified as serious, with serious assaults on staff have trebling since 2013 to reach 805 in the year to March.
Peter Dawson, the campaign group's director, said: "The appalling loss of life and toll of despair requires something more immediate than the promise of more staff and new prisons".
A surge in the number of prisoners failing to return to prison after being released on a temporary licence was recorded previous year.
In 2016/17 there were 267 temporary release failures, 42 of which were failures to return, resulting in prisoners being unlawfully at large.
Administrative errors lay behind some errors which saw prisoners released too early 5. The number of suicides dropped slightly to 97, including six women. They are Bedford, Birmingham, Bristol, Brixton, Guys Marsh, Hindley, Liverpool, Pentonville, Wandsworth and Wormwood Scrubs.
The report said: "The Government is reforming the way prisons work in order to improve how they protect the public, keep staff and prisoners safe, and help offenders turn away from crime".
"These figures reinforce how crucial it is that we make progress as quickly as possible", he said.
"Boosting the frontline is critical to achieving safety and the number of prison officers we are recruiting is rising, with the number of new prison officers joining the service at its highest level since 2010".
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