GLOSTRUP, Denmark (Reuters) - Three men suspected of planning a deadly attack on a Danish newspaper appeared on Thursday before a court which charged them with an attempted act of terrorism and possession of weapons, officials said. Police detained four men in Denmark and one in Sweden on Wednesday on suspicion of plotting an assault on offices of Jyllands-Posten, the Danish daily that outraged Muslims in 2005 with blasphemous cartoons. The three - one Tunisian and two Swedish citizens - pleaded not-guilty to the charges, Lykke Sorensen, an official of the Danish Security and Intelligence Service PET, told reporters at Glostrup courthouse. Police brought the three suspects to a court in the Copenhagen suburb of Glostrup, which ordered that they be held in custody for four weeks pending more investigations. The three persons will now be held in custody for four weeks, of which the first two are in isolation, Sorensen said. The investigation will continue in close cooperation between the police, the PET and (Swedish security police) SAPO.