Copenhagen police said Thursday they had detained four people on suspicion of joining the "Islamic State" (ISIS) terrorist group in Syria and seized weapons and ammunition in a search linked to the arrests, AFP reports.
All four were suspected of breaking Denmark's terrorism law while in Syria, and were arrested in the Copenhagen area, police said in a statement without giving any further information on their identities.
"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.