An Austrian teenager has confessed to murdering a man he met in a homeless shelter and eating parts of his brain and internal organs, authorities said.

The 19-year-old, named only as Robert A, is alleged to have killed his 49-year-old roommate by crushing his skull with a 20lb iron bar, before using a butcher’s knife to remove the man’s intestines.

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The murder is believed to have taken place at least three days ago and was discovered yesterday when a cleaner entered the shelter. The man allegedly told her about the murder and asked her to inform the police.

Officers who arrived at the ground-floor flat in the 15th district of Vienna found the body lying in a pool of blood, with body parts spread around the room. Half-eaten parts were found on a plate in the kitchen.

The 19-year-old was sitting next to the victim, his clothes allegedly soaked in blood. He reportedly greeted the officers by saying: “Just look what happened here.”

A police investigator said of the scene: “We are supposed to be prepared for situations like this, but this surpasses the limits of imagination.”

The two men reportedly lived alone in the shelter, a two-bedroom flat that is run by a private social care company, financed partly by the city authorities. It was created as a first-aid accommodation for mentally ill people living on the street. The residents receive weekly visits from social workers.