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. ||||| Danish prosecutor says inventor cut Swedish journalist’s throat or strangled her on board vessel 
 
 The Danish inventor Peter Madsen has been formally charged with the murder of the Swedish journalist Kim Wall, a public prosecutor has said. 
 
 Jakob Buch-Jepsen said the 46-year-old either cut Wall’s throat or strangled her after she boarded his self-built submarine for an interview in August last year. 
 
 The self-taught engineer was charged with murder and indecent handling of a corpse, the Danish prosecutor said. 
 
 
 
 Wall’s headless and dismembered torso was found floating off the coast of Copenhagen 10 days after she was reported missing, and her head, legs and clothes were discovered in bags at sea in October. 
 
 In a case that Buch-Jepsen described as “very unusual and extremely disturbing�?, the inventor was also charged with sexual assault, without intercourse, of “a particularly dangerous nature�?. 
 
 Police said Madsen faced a life sentence if convicted. 
 
 Facebook Twitter Pinterest Officers board Peter Madsen’s submarine UC3 Nautilus on a pier in Copenhagen in August. Photograph: Jacob Ehrbahn/AP 
 
 In earlier police questioning, Madsen denied cutting up Wall’s body and claimed the 30-year-old died in “a terrible accident�? when a heavy hatch cover accidentally fell on her head during their brief voyage on the 17-metre (56ft) submarine. 
 
 He later changed his story, saying Wall, who was researching a profile about him, died of carbon monoxide poisoning while on board. He admitted dismembering her body, weighting her body parts and throwing them into the sea. 
 
 Prosecutors have said that 15 stab wounds were found on Wall’s body, including 14 around the genital area. Traces of Madsen’s DNA were found on the body, as well as the marks of a saw blade consistent with the removal of her head and limbs. 
 
 A police examination of Madsen’s computer uncovered material featuring women being tortured and killed. 
 
 Wall, who had written for the Guardian and the New York Times, was last seen alive on the Nautilus on 10 August. After her boyfriend reported her missing, the submarine was located south of Copenhagen the following morning. 
 
 Madsen, who was rescued and arrested just before the vessel sank, initially claimed to have set the journalist down on dry land. 
 
 The start of the trial has been set for 8 March and a verdict is expected on 25 April.
– 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.