COPENHAGEN (Reuters) - (This October 3 story has been refiled to Corrects detention period to four weeks, not four months, in seventh paragraph.) 
 
 Peter Madsen, Danish inventor, engineer, rocket- and u-boat builder, talks about entrepreneurship during Danish Business Day event held in Copenhagen, Denmark, May 9, 2017. Scanpix Denmark/Ida Marie Odgaard/via REUTERS 
 
 A Danish inventor charged with murdering Swedish journalist Kim Wall in his home-made submarine had video footage on his computer showing women being violently killed, a court heard on Tuesday. 
 
 A police prosecutor said officers found images “which we presume to be real” of women being strangled and decapitated on the hard drive on Peter Madsen’s computer in a laboratory he ran. 
 
 That, together with new post-mortem evidence showing Wall was stabbed in her ribcage and genitals “around or shortly after her death,” was adding to the case against Madsen, the prosecutor, Jakob Buch-Jepsen, told the Copenhagen court. 
 
 DNA tests from Madsen’s nails, face and neck showed a clear match with Wall’s, Buch-Jepsen said, though the exact cause of death remained unknown. “Our suspicion hasn’t changed, it has been strengthened since (the last hearing on) September 5,” he added. 
 
 Madsen, who denies murdering Wall and another charge of mutilating her body, appeared in court via video link dressed in a green boilersuit. 
 
 He said the computer searched by police was not his. “They are the space laboratory’s tools which have been used by everyone in the laboratory,” he said. The court heard he had been working on building a space rocket in the lab. 
 
 He remained calm during the pre-trial session, sitting with his hands folded most of the time. The court ordered him detained for another four weeks as investigations continued. 
 
 Wall, a 30-year-old freelance journalist who was researching a story on Madsen, went missing after he took her out to sea in the 17-metre (56-foot) craft in August. 
 
 Madsen has told the court in past hearings Wall died accidentally, saying she was hit by a heavy hatch cover on his UC3 Nautilus submarine. 
 
 On August 23, police identified a headless female torso washed ashore in Copenhagen as Wall’s. 
 
 Madsen has also denied amputating her limbs, saying he tried to bury her whole body at sea. ||||| Cause of journalist’s death yet to be established, court hears, as murder suspect Peter Madsen’s custody is extended 
 
 The suspected killer of Swedish journalist Kim Wall will be detained for four more weeks after a Copenhagen court heard that 15 stab wounds had been found on her body. 
 
 Peter Madsen, 46, faces a murder charge over the death of the 30-year-old journalist, whose headless, dismembered torso was found floating off Denmark’s capital city 10 days after she boarded the inventor’s self-built submarine for an interview. 
 
 
 
 Prosecutor Jakob Buch-Jepsen told the court that cause of death had not yet been formally established, but that the multiple knife wounds had been inflicted “at the time of death or shortly afterwards”. 
 
 Traces of Madsen’s DNA had also been also recovered from Wall’s body, as well as traces of a saw blade consistent with the removal of her head and limbs after her death, Buch-Jepsen said. An examination of Madsen’s computer had also uncovered material featuring women being tortured and killed. 
 
 Madsen, who denies killing Wall, took part in the half-hour custody hearing with his lawyer via a video link from Copenhagen’s Vestre prison. He said he was “not the only person” with access to the computer in his workshop, and the extreme content did not belong to him. 
 
 His defence lawyer, Betina Hald Engmark, said the court had heard “nothing that supports Kim Wall being killed by my client”. No investigations had been carried out to substantiate Madsen’s claim that the journalist died in an accident and that her body was still intact when he disposed of it at sea, she said. 
 
 Madsen told a hearing last month that the journalist died when a 70kg hatch cover fell on her head while she was climbing on to the deck of the surfaced submarine. “It was a terrible accident, a disaster,” he said. 
 
 Feeling “suicidal”, he attached a metal weight around her waist so her body would sink, and planned to sink his submarine, taking his own life, he said. “In my shock I thought it was the right thing to do,” he told the court. 
 
 
 
 Wall, who had written for the Guardian and New York Times, was last seen alive on the Nautilus on 10 August. After her boyfriend reported her missing, the 18-metre submarine was located south of Copenhagen the following morning. 
 
 Madsen, an entrepreneur, artist, submarine builder and self-taught aerospace engineer, was rescued just before the vessel sank, and arrested. He will appear in court again on 31 October.
– The Danish inventor charged with manslaughter in the death of a Swedish journalist aboard his submarine had videos of women being tortured and murdered on his computer, a police prosecutor told a Copenhagen court Tuesday. Jakob Buch-Jepsen testified that the video footage, "which we presume to be real," showed women being strangled or decapitated. Peter Madsen, who appeared in court via video link, said the computer police searched was not his, but was used by everyone in a laboratory he ran. Madsen claims journalist Kim Wall was killed in August when she was accidentally hit by a hatch cover while researching a story on Madsen onboard the submarine he built. New postmortem evidence was also presented in court; it shows that Wall was stabbed in her ribcage and genitals "around or shortly after her death." Fifteen stab wounds were found on her body. Citing Buch-Jepsen's testimony, Reuters reports that DNA taken from Madsen's nails, face, and neck matched Wall's DNA, while the Guardian reports that traces of Madsen's DNA were recovered from Wall's body. Her cause of death remains undetermined. The court extended Madsen's detention as the investigation continues; he is due back in court Oct. 31.