Later Monday, an emotional ceremony was held on the shores opposite Utoya island.
"Today our thoughts are especially with all parents, siblings, partners and families who lost what was dearest to them," said Eskil Pedersen, the head of the Labor Party's youth chapter and a survivor of the massacre.
He said many survivors and relatives are still struggling with their daily lives.
"There are still many who are burdened with grief, who struggle to concentrate in school or at work, who see that Norway has moved on, but who don't feel they have the power to do the same," he said. "My hope is that this community has room for everyone who was marked for life on July 22. Let us be there for each other, even if July 22 is no longer talked about on a daily basis."