The biggest prison in the country, HMP Oakwood, has been slammed by inspectors.
HMP Oakwood, which can hold 1,600 prisoners, had inexperienced staff and high levels of violence and self-harm, said HM Inspectorate of Prisons following a surprise visit.
The report found that the prison, known as "Jokewood", needs to address its approach to the near-300 sex offenders it holds, many of whom were due for release without their offending having been addressed.
G4S, which runs the prison, says it has already taken steps to make improvements.
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Four men were thrown from one of the cars, and three died at the scene. A taxi driver and his two passengers were also killed.
A chilly and foggy morning with strong outbreaks of wind but it will become milder in the afternoon.
Early frost and fog should soon clear, leading to cloud and rain spreading from the northwest.