OSLO, Norway -- Former Norwegian Prime Minister Gro Harlem Brundtland, who left the Utoya island youth camp just hours before a gunman massacred 69 people there, said Thursday the day will be remembered as one of the country's darkest.

Speaking at the funeral of 16-year-old victim Marianne Sandvik in the southwestern city of Stavanger, a tearful Brundtland said "the loss of a young life can never give any meaning."

Brundtland, who was premier for 10 years, led a left-leaning government with liberal immigration policies.

The man who has confessed to the youth camp slaughter and a car-bombing in Oslo that killed eight denounced Brundtland and immigration in a manifesto sent shortly before the July 22 attacks.

Norwegian prosecutor Christian Hatlo told reporters Thursday that the confessed gunman, 32-year-old Anders Behring Breivik, had been questioned for 10 hours the previous day. He said the interrogation included questions about Breivik's travels overseas.

Breivik claims to have had contact with other terrorist "cells," but it remains unclear whether he had logistical or financial support from abroad.