Four men were detained in Denmark on suspicion of belonging to a network planning a suicide terror attack in Europe, police said Friday. The men, all Danish Muslims aged 16 to 20, were arrested Thursday morning. At a court hearing late Thursday they were ordered held in jail until November 16 as police continue the investigation, police spokesman Joern Bro said. He declined to give details, saying only the network had planned to carry out the suicide attack in Europe. Danish media quoted Bro as saying that the arrests in Copenhagen were linked to an investigation in the Balkans in which arrests were made and large quantities of explosives were found on October 19. According to Sarajevo's Dnevni Avaz daily newspaper, one of the three suspects was an 18-year-old who was preparing a suicide bomb attack on the Sarajevo embassy of an European Union country. Denmark has not been hit by terrorists in 20 years, but fears have grown the Scandinavian country could face an attack after the July attacks on the London transit system. Like Britain, Denmark is part of the US-led coalition in Iraq and has about 500 troops stationed there.