OSLO — A Norwegian court has ruled that the right-wing extremist who confessed to killing 77 people in a bombing and shooting spree must undergo a second psychiatric evaluation against his will.

The Oslo district court said Friday that Anders Behring Breivik can be placed under observation for up to four weeks at the prison where he's being held in pretrial detention.

Two psychiatrists who interviewed Breivik found him criminally insane but a second evaluation was ordered amid criticism of that diagnosis.

The 32-year-old Norwegian has rejected the need for another analysis. He admits to the July 22 attacks in Oslo and at an island retreat for the governing Labor Party's youth wing, but denies criminal responsibility for the deaths.