Gunman: Two more cells exist

OSLO - The man who has confessed to carrying out a bombing and shooting spree that left 76 people dead in Norway will be held for eight weeks, half of that in complete isolation, after a closed hearing in which he said his terror network had two other cells.

Anders Behring Breivik has confessed to the attacks but denied criminal responsibility, pleading not guilty on Monday to one of the deadliest modern mass killings in peacetime. He told the court he wanted to save Europe and send a strong signal, Judge Kim Heger said after a closed court hearing.

Breivik could tamper with evidence if released, and will be held for at least another two months without access to visitors, mail or media, the judge said. Typically, the accused is brought to court every four weeks while prosecutors prepare their case, so a judge can approve his continued detention. Longer periods are not unusual in serious cases.