Police arrested four Danish Muslims Thursday on suspicion of belonging to a network planning a suicide terrorist attack in Europe, officials said.
The suspects, all males between 16 and 20 years old, were ordered held in jail while police investigate the allegations, police spokesman Joern Bro said.
He said at a news conference that the network had planned to carry out the suicide attack in Europe, but he declined to provide further details.
The suspects, who were not further identified, faced a judge in a closed-door hearing late Thursday in Glostrup, a suburb of Copenhagen.
Danish media quoted Bro as saying that the arrests in Copenhagen were linked to an investigation in the Balkans in which arrests were made this month and large quantities of explosives were found.
He did not specify where the Balkan investigation took place but Bosnian police said last week they arrested three people in Sarajevo on suspicion of undertaking terrorist activities.
Police said they found explosives, firearms and other military equipment in connection with those arrests on Oct. 18 and 19.