A source said the remand prisoners were creating "significant risk" for police and Sunday's incident was proof of that.
"The risk is extreme, both to the police staff and the prisoners. Often prisoners go for days without exercise, seeing daylight or any stimulation and are made to sit in their cells and do nothing... they become very angry and difficult to manage which is (causing) extreme risk with the police staff."
But Waitemata District Commander Superintendent Bill Searle maintained the station had
appropriate facilities to hold remand prisoners for short periods.
"Depending on demand, this at times may mean a higher number of remand prisoners are being held," he said.
"However, police has escalation plans in place to manage increases in prisoner numbers, which includes bringing in more staff as required to ensure a safe ratio of staff to prisoners."
Mr Searle said police would continue to support the Department of Corrections who were "leading the work to manage the issue".
Corrections national Commissioner Jeremy Lightfoot said a seasonal spike was "normal" especially after the holiday period. But this spite exceeded the Ministry of Justice prison forecast.
"We had an unprecedented rise in remand numbers over Christmas 2014. The Justice Sector Forecast has accurately predicted a drop in numbers every year, however, this year that didn't eventuate. We are working with Justice and our own research teams to understand the cause of this," he said.
"There are a number of factors leading to the current spike in offenders being remanded in custody, however, the primary reason are the changes to the law around bail whereby people who have committed violent offences or are on particular drug charges cannot be bailed.
"The inflows into the prison system have not changed, but less people are being bailed."
Mr Lightfoot said Corrections worked to ensure no prisoner was held in police cells for longer than is absolutely necessary. On average they were moved within 24-72 hours.
"Corrections has... robust contingency plans to ensure that all prisoners are appropriately housed, even in situations where remand prisoner numbers are fluctuating. We are confident in our ability to manage prison muster fluctuations. We work closely with police to ensure that remand prisoners held in police custody are appropriately managed... we will continue to make use of local police cells when appropriate," he said.
The opening of the Auckland South Corrections Facility in May would ease pressure on police.
"In total the facility will provide 960 beds when it's fully operational. This is in the area that beds are needed most," said Mr Lightfoot.
What is a remand prisoner?
• Someone held in custody while they wait for their trial or sentencing.
• A remand prisoner could be held in police cells, court cells, psychiatric facilities or prison.
• About 20 per cent of the people in prison are on remand.
• People on remand are kept separate from sentenced prisoners, in units or wings only for remand prisoners.
• Any time spent on remand is taken off a person's total sentence time.
