Thankfully they got it in time, relevant quote:https://www.yahoo.com/news/norways-security-takes-over-explosive-device-case-083455558.html
The youth was not identified, but security service head Benedicte Bjornland said intelligence agencies were aware of him. He is an asylum-seeker from Russia who arrived in Norway with his family in 2010, Bjornland said.
Bjornland also alleged that the youth was part of "extreme Islamism" circles in Norway.
"It is likely that that attacks in France, German, Great Britain, Russia and Sweden can create a copycat effect in Norway with people with Islamic sympathies," Bjornland said, listing of the locations of extremist attacks that have devastated Europe in the last year.