The Queen Elizabeth Hospital in Norfolk has promised to take swift action to improve its quality of care after being placed in special measures.
Following confirmation from the Care Quality Commission that the health regulator Monitor was to intervene, the King's Lynn trust apologised to patients.
Acting chief executive at the QEH, Sharon Beamish, said: "We accept the reports' findings and as a board we will work with Monitor to do everything we can to put things right as quickly as possible."
The hospital said it was taking immediate action to ensure wards were adequately staffed.
A further 35 nurses from Portugal are due to start work at the King's Lynn site in November and December and the trust is continuing to recruit from across the UK - including newly-qualified staff from the University of East Anglia and Anglia Ruskin University.
A Norfolk hospital has been placed in special measures after "consistently failing to meet the national standards of quality and safety", the Care Quality Commission (CQC) has confirmed.
The Queen Elizabeth Hospital, in King's Lynn, has been warned it must improve standards as quickly as possible.
It follows a request by the CQC to regulator Monitor to step in and place the Gayton Road hospital in special measures after it was found to be failing on "more than one occasion".
The QEH was issued with a formal following an inspection in August which found low staffing levels and a lack of training in connection with dementia care. Patients were also found to be at risk because systems in place were not robust enough.
It followed an earlier inspection in May when the hospital was also told to improve.
Sir Mike Richards, chief inspector of hospitals for the CQC, said: "The concerns we found ... were so great we felt it was necessary to request that Monitor intervene and place the trust into special measures to assist in driving through improvements for patient care."
The trust will be closely monitored by the watchdog to ensure standards are raised.
Norfolk MPs Elizabeth Truss and Henry Bellingham have written to the Health Secretary Jeremy Hunt to request an urgent meeting to seek action on problems at the Queen Elizabeth Hospital in Kings Lynn.
Last week reports by the Care Quality Commission and Monitor identified a number of failings at the hospital, including missed A&E waiting times and poor staffing levels. The MPs are seeking an urgent solution.
They said: “Residents need to know that the health care they receive in West Norfolk is of the highest possible standard and we plan to ensure this is delivered. That is why we have raised the situation at the Queen Elizabeth hospital with the Secretary of State for Health.”
Health regulators have demanded that a Norfolk hospital take immediate action to improve its failing care standards.
The Care Quality Commission has criticised the Queen Elizabeth Hospital in King's Lynn for issues including staff shortages and poor care and record-keeping.
On the same day, a second health regulator, Monitor, announced it is to take further action against the hospital after the trust failed to meet the conditions of its licence to operate.
Monitor says it is concerned patients have to wait too long to be seen in A&E, after the trust failed to meet the national target for three consecutive quarters.
Now the hospital says it is taking steps to improve care - these include:
Recruiting additional staff - the trust says 40 nurses have already joined this summer with a further 40 being recruited.
It will also have extra cash to improve A&E which include extra treatment space and four additional consultants.
The trust has commissioned an independent review, to look at the way the hospital runs.
The Health Minister and North Norfolk MP Norman Lamb said: "The concerns of the CQC are very serious, particularly about staffing ratios and about monitoring and ensuring there is a high quality of care at all times."
Click below to watch the interview with Norman Lamb
Doctors at the Queen Elizabeth Hospital in King's Lynn say the snow has resulted in a steady stream of accident victims arriving at the hospital.
There are warnings to both drivers and those on foot that they should take care during this wintery weather. Doctors say that they don't usually get a sudden influx during heavy snow, but when the snow starts to melt and then turns into ice, that's when the problems start.