A Norwegian flag and dozens of flowers are held up as tens of thousands of people gather in Oslo city center for a vigil on July 25, 2011, three days after the attacks.
CNN  — 

Ten years ago, Norwegian far-right extremist Anders Behring Brevik killed 77 people, many of them teenagers, in a bomb attack and gun rampage. The July 22 attacks left Norway, a small, close-knit Nordic country, stunned and grieving.

Just over a year later, Breivik was sentenced to 21 years in prison, the maximum possible term. And Norway, led by then-Prime Minister Jens Stoltenberg, came together in a show of unity in the wake of the deadliest violence seen there since World War II.

A decade on, the anniversary will be an occasion of great sadness for many in the country of just over 5 million people. Several commemorative events are taking place Thursday in the capital, Oslo, and on Utoya Island, where the attacks took place.

At a televised memorial concert, King Harald said lessons could be learned. “Certain dates are written into our country’s story as defining days. Days, which in different ways, have contributed to making us who we are today,” he said, according to Reuters.

“At the same time, we must acknowledge that we as a society have not done nearly enough to see, to help, to carry the burden together - and to counteract the dark forces,” he added.

But it has also prompted questions about the wider impact of Breivik’s radical views on far-right extremism – circulated in a 1,500-page “manifesto” shortly before the attacks – and some soul-searching about how Norway deals with his legacy.

In a national memorial address at Oslo Cathedral just two days after the attacks, Stoltenberg called for “more democracy, more openness, and more humanity.”

Speaking with CNN’s “Amanpour” show in an interview to mark the anniversary, Stoltenberg – now NATO secretary-general – repeated that message and applauded the way Norwegians had responded. But, he warned, the “hatred is still out there.”

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We hoped the reports were exaggerated: Ten years later, Norway's PM reflects on devastating event
11:24 - Source: CNN

Last month, the University of Oslo’s Center for Research on Extremism (C-REX) published a series of analyses looking at Breivik’s long-term influence.

The author of one of the reports, Dr. Jacob Aasland Ravndal, told CNN it appeared more limited than media coverage would suggest. “There was of course a lot of concern after the attacks that they would generate copycat attacks,” he said. But “somewhat surprisingly,” he said, there haven’t been many clear-cut cases of direct inspiration from Breivik.