“All four suspects are accused of having violated the penal code…by allowing themselves to be recruited by IS in Syria to commit terrorists acts”, a statement by Copenhagen police said.
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It said those held were suspected of plotting to commit violence after recruitment by the Syrian branch of the terrorist group.
The police would not provide more details on the identities of the six, or the charges against them.
“The suspects have been identified through investigations carried out in close cooperation between the Danish Security and Intelligence Service and Copenhagen police”, the statement said.
The cache of weapons were recovered in a connected search. They will appear before a judge for preliminary hearings on Friday.
Two civilians were killed and five police officers wounded, according to Danish authorities.
PET’s operational head, Flemming Dreyer, said people who had been in conflict zones in Syria and Iraq “could pose a terrorist threat against Denmark due to their experience and skills”, but added there was no reason to change the threat assessment following Thursday’s arrests.
The infiltration of armed ISIS militants in Europe has become a big worry after deadly attacks in Brussels, Belgium, in March and Paris in November. In Denmark specifically, 125 residents had left to fight for the group and 62 may have returned.
The Danish city of Aarhus has drawn global attention for its “soft-hands” approach to battling the radicalisation of young Muslims with social techniques used in gang exit strategies.
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In February 2015, a man swore fidelity to ISIS leader Abu Bakr al-Baghdadi in a Facebook post before attacking a free speech forum featuring a controversial Swedish artist and then firing shots near a synagogue in Copenhagen.
