The man has made a partial confession, police say.
“He was first taken in for questioning, at which certain facts emerged which caused us to start treating him as a suspect,” said Sven Matzols of Dalarna police.
The couple, a 59-year-old man and his 62-year-old wife, were found dead on Saturday afternoon in the cellar of their house. Aftonbladet reports that their elder son had called the police after trying unsuccessfully to contact his parents for several days.
The man may have lived in the house with his dead parents’ bodies for several days before police were alerted, Aftonbladet writes.
The 18-year-old was in Falun hospital when police found out about the murder. He had crashed his father’s Volkswagen Golf the night before. He was then taken from the hospital by police for questioning. Police said he did not try to resist their attempt to bring him in for questioning.
The son has no previous convictions, and was not previously known to the police.
Police have called in forensic scientists and pathologists from Stockholm and Uppsala to examine the house and the bodies. News agency TT reports that the parents’ bodies show clear external evidence of an attack.
The 18-year-old’s lawyer, Johan Matz, said he spoke with his client for one hour on Saturday evening, but would not reveal any details of the conversation.
“It is too early in the investigation,” he said.