Corrections Minister Judith Collins is rejecting claims that “fight clubs” have been occurring in prisons since 2009, when she was last minister.

Private prison operator Serco revealed yesterday that there were two previous investigations into organised violence at Mt Eden Corrections Facility (MECF) in 2014 and the old prison at Mt Eden in 2009.

The company is seeking a revision of a new investigation into “fight clubs” at MECF, saying that it ignored these past two inquiries – one of which took place under Ms Collins’ watch.

Ms Collins said this morning that the investigation in 2009 did not uncover anything at the old Mt Eden Prison.

“The allegations were looked at at the time and there is no evidence of it,” she told reporters.

The minister also dismissed the suggestion that the two reports indicated there was a long track record of organised violence at the Mt Eden prisons.

She argued that the two investigations were at different jails – the old Mt Eden Prison, which closed in 2011, and the new MECF remand prison.

“It’s not the same site, it’s not the same prison, it’s next door to it,” she said. “Totally different organisation, totally different institution.”

Serco took over the MECF in 2011, but Corrections stepped in and took over day-to-day control of the prison last year following reports of widespread violence and drug use among prisoners.

A draft report on violence within the prison was completed by the Chief Inspector of Prisons in September, but Serco is challenging it in the High Court.The hearing in the Wellington High Court is expected to wrap up today.