Danish police arrested four men on Thursday who they suspect of volunteering to fight with the Islamic State extremist group in Syria.
A series of raids led to a total of six arrests in the greater Copenhagen area in cooperation with the Danish police security service PET, according to a police statement.
Two men were arrested in connection with weapons and ammunition found during the raids, police said. The two were suspected of violating gun laws, but the statement did not mention terrorism suspicions.
Police declined to offer further details or give information about the intelligence they had acted on regarding the arrests.
A remand custody hearing was due on Friday. The prosecution said it will request a closed door session for the four linked to Islamic State.
According to a PET assessment from March, at least 115 people have travelled from Denmark to Syria or Iraq to join jihadist groups such as Islamic State. At least 19 of them have died.