A Copenhagen judge later remanded the two suspects to 10 days’ detention.
The killings shocked Danes, who pride themselves on a welcoming and safe society, and fed into a national debate about the role of immigrants. The populist Danish People’s Party, which campaigned against the building of a mosque, has strong support in the polls.
Denmark became a target 10 years ago after the publication of cartoons lampooning the Prophet Muhammad, images that led to sometimes-violent protests in other countries.
The detention of possible accomplices may heighten fears that this was not just an attack by a lone shooter, but possibly backed by a more organized group of marginalized youths radicalized by time in jail or unemployment.
There was no suggestion that foreign groups played a role, however.
"We're not talking about a fighter who has been abroad in Syria or Iraq. We are talking about a man who was known to the police due to his gang activities, criminal activities inside Denmark," Foreign Minister Martin Lidegaard told the BBC.
So far there has been no claim of responsibility from any radical groups, and no videos or statements from the killer. Police have said the man was known to them due to his past criminal activities.
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