Police and prosecutors in northern Italy are wrestling with a mystery that brings together a man with memory loss, evidence of devil worship and a blood-drenched apartment.

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He has since been identified as a 22-year-old called Daniele - investigators have not released his surname - who, until recently, worked in a nearby factory. His family said his only real hobby was UFOs.

They told police that, last September, he had suddenly broken with his past. He had left his job and spent his savings, though his relation with his parents, whom he now says he cannot recognise, continued to seem normal.

Among the puzzles vexing investigators are how a man who had lost almost seven pints of blood could have made his way 70-odd miles across country - and what happened to him in the at least three days that he was missing.

Aliens must be using death metal for mind control. I think I finally understand people's fascination with power point.