The extremist, who has already served 10 years of a maximum 21 year jail sentence, was described as still a "very dangerous man" on the third and final day of his parole hearing in Skien.

The prison term can be extended indefinitely if he is deemed a continued threat to society.

Prosecutor Hulda Karlsdottir said the mass killer, now aged 42, had "not shown any genuine remorse in court" and that his behaviour was part of a PR stunt.

'Parole should not be granted'

"In the clear view of the prosecution, Breivik's request for parole should not be granted," she said in closing arguments.

On the hearing's first day, Breivik professed white supremacist views and made Nazi salutes while he claimed to be reformed.

Proceedings have taken place in a prison gymnasium which was converted into a makeshift courtroom.

A psychiatrist, who has observed him since 2012, told the court that Breivik cannot be trusted.

'Imminent danger'

And a prison official also said there was an "imminent danger" of him committing further serious violent crimes if released.

The Norwegian extremist was convicted in 2011 after setting off a bomb in Oslo's government district and then carrying out a shooting spree at a summer camp for left-wing youth activists on Utoya island.

At his trial, Breivik was declared criminally sane, despite the prosecution's claims that he was psychotic.

He did not appeal his 21 year sentence, but he unsuccessfully sued the government for human rights violations for denying him the right to communicate with sympathisers.

Although Breivik is serving Norway's maximum sentence, he is under the provision of being kept in prison for as long as he is deemed a menace to society.

The court is expected to rule on his parole request later this month.