KONGSBERG, Norway, Oct 14 (Reuters) - A bow-and-arrow attack in which a Danish convert to Islam is suspected of killing five people in a Norwegian town appears to have been an "act of terror", police said on Thursday. Investigators named the suspect as Espen Andersen Braathen, a 37-year-old living in the Kongsberg municipality where the attacks took place on Wednesday evening. A police attorney told Reuters that Braathen had acknowledged killing the victims. His lawyer confirmed only that Braathen was cooperating with police and giving a detailed statement. Police had been concerned about signs of radicalisation in the suspect before the attacks, carried out with a bow and arrow and other weapons, a senior officer said. Flags flew at half-mast across Kongsberg after the deaths of four women and a man, all aged between 50 and 70. Three others, including an off-duty police officer, were wounded. "The events at Kongsberg appear at the moment to be an act of terror," the PST security police said in a statement, adding the investigation would determine the motive. Regional police chief Ole Bredrup Saeverud said the suspect had converted to Islam. "Police have previously been in contact with the man in relation to trouble connected to radicalisation. We haven"t registered anything in regards to him in 2021, but previously," Saeverud told a news conference. The head of Norway"s PST security police, Hans Sverre Sjoevold, said Braathen had a history of being "in and out" of health institutions. Determining whether the attack was an act of terrorism or the result of a psychiatric issue "will be a vital, important part of the investigation", he told Reuters. The method of the attack, said Sjoevold, was similar to many politically motivated attacks carried out in Europe in recent years. "The use of knives, public places... The police are not present, so they can carry out the ... attack. That"s quite typical for these operandi," he told Reuters. ARROW IN THE BACK On Wednesday, Kongsberg resident Markus Kultima, 23, who works in a beer shop, witnessed parts of the attack. Norwegian police attorney Ann Iren Svane Mathiassen talks to reporters outside the police station in Kongsberg, Norway, October 14, 2021. REUTERS/Victoria Klesty An arrow left in a wall is seen after several people were killed and others were injured by a man using a bow and arrows to carry out attacks, in Kongsberg, Norway, October 13, 2021. Terje Bendiksby/NTB/via REUTERS Police officers investigate after several people were killed and others were injured by a man using a bow and arrows to carry out attacks, in Kongsberg, Norway, October 13, 2021. Terje Pedersen/NTB/via REUTERS 1/9 An arrow left in a wall is seen after several people were killed and others were injured by a man using a bow and arrows to carry out attacks, in Kongsberg, Norway, October 13, 2021. Terje Bendiksby/NTB/via REUTERS "I saw a man come walking with an arrow in his back," Kultima told Reuters. He said it was the off-duty officer who told him to head home. Braathen was in custody and was believed to have acted alone, police said. A court will decide on Friday how long police can keep him in custody. Police attorney Ann Iren Svane Mathiassen told Reuters: "He has told us that he has killed them and he has explained himself in detail about what happened... He admits to the facts of the case but we haven"t asked him yet about the question of guilt." She said police wanted a psychiatric evaluation to determine whether he is fit to stand trial, and that those killed "appear to be random victims". A relative of the suspect, speaking on condition of anonymity to Danish newspaper Ekstra Bladet, described him as mentally ill and said the family had suffered threats for several years. The death toll was the worst of any attack in Norway since 2011, when far-right extremist Anders Behring Breivik killed 77 people, most of them teenagers at a youth camp. The attacks took place over "a large area" of Kongsberg, a municipality of about 28,000 people in southeastern Norway, 68 km (42 miles) from the capital, Oslo. Police said they received reports of a man carrying a bow and arrow at 1612 GMT on Wednesday. He was first observed by a police unit a few minutes later, fired arrows at the police and was apprehended after a hunt lasting about 35 minutes. "It is likely that all the killings took place after the first police sighting of him," Saeverud said. Images from one of the crime scenes showed an arrow that appeared to be stuck in the wall of a wood-panelled building. Prime Minister Jonas Gahr Stoere, on his first day in office after winning an election last month, said his thoughts were with the people of Kongsberg, the victims and "those who live with the shock." He told a news conference the attack highlighted shortcomings in Norway"s psychiatric care, with "one in four or one in five" people who are referred for treatment being turned down. King Harald wrote a letter of condolence to the town"s mayor, saying: "The rest of the nation stand with you." Those laying flowers and candles in tribute spoke of their shock in a country where mass killings are rare. "I want to show my sympathy and empathy to all those affected here in town and across Norway actually because it affects all of us, regardless of who we are - young and old," Kongsberg resident Line Leirmo said.