Police on Wednesday identified a headless female torso washed ashore in Copenhagen as that of Swedish reporter Kim Wall, who they believe was killed by a Danish inventor on board his home-made submarine.

Wall, who was researching a story on inventor Peter Madsen, went missing after he took her out to sea in his 17-metre submarine on Aug. 10.

When they began the journey in the submarine it reportedly sank, but Madsen could be safed. At that time the rescuers didn’t know that the young journalist was in the submarine as well because Madsen didn’t tell them. When asked about her whereabouts, Madsen denied even meeting her.

Announcing the results of tests on the torso, discovered by a passing cyclist on Monday, police spokesman Jens Moller said it had suffered damage suggesting “an attempt to make sure air and gas inside should leave the body so that it would not rise from the seabed”.

He added: “There was also some metal attached to the body, allegedly also to make sure the body would sink to the bottom.”

Peter Madsen is a popular rocket and private submarine inventor in Denmark and is known for his weird persona.