OSLO, Norway -- After nearly 10 weeks of grueling testimony of one of the worst peacetime massacres in modern history, it's time for prosecutors to decide their position on whether they think Anders Behring Breivik is insane or not.

"The decision has been made," prosecutor Svein Holden told reporters Wednesday. But prosecutors declined to say what that was a day before closing arguments in a trial that has captivated Norway since the middle of April.

Ultimately, judges will decide Breivik's mental state when they hand down a verdict in July or August.

The mass killer has admitted he carried out the bombing and shooting rampage that left 77 dead on July 22, so guilt is not an issue. The issue will be whether to send him to prison or a mental institution.