Forensic investigators are testing whether a saw recovered from the sea off Copenhagen was used to dismember the body of Swedish journalist Kim Wall.

Divers found the saw Wednesday on the same route sailed by inventor Peter Madsen’s home-made UC3 Nautilus submarine, which Wall was last seen on before she vanished on Aug. 10, The Local Sweden reported.

The Columbia journalism-school graduate’s torso was found on Aug. 21 and last week, her head, legs and clothes were found in plastic bags weighed down by metal pipes.

Police investigator Jens Moeller Jensen said Thursday they were still searching for her arms, CBS News reported.

Madsen, 46, is in pretrial detention on manslaughter charges and claims he “buried,” the journalist at sea when she died in a “terrible accident,” after being hit by a 155-pound hatch door aboard the ship.

He has plead not guilty and announced through his lawyer that he was refusing to answer any new police questions about the case, according to The Local Sweden.

Authorities said there was no evidence of fracture’s or blunt force trauma to Wall’s decapitated skull and her cause of death has not been established yet.

Wall, who was a freelancer in New York and China, reported on topics as diverse as Cuba’s internet pirates and Ugandan capital Kampala’s Chinatown, and did not know Madsen before she boarded his ship for a story.

Her friends described the 30-year-old as “invincible,” “ambitious,” and “always seeing the good in everyone,” Swedish media reported.