Stockholm police have launched a preliminary investigation into a case in which a mother is suspected of holding her own son in prison.

According to Aftonbladet, the woman had held her son in prison for up to 30 years.

The woman’s 41-year-old son was found lying in poor condition under a blanket on the floor of an apartment building.

According to Aftonbladet, he was badly malnourished, lost all his teeth, communicated poorly and his body was full of wounds.

The man could barely move.

The man was found when the mother's female relative had come to the apartment on Sunday, when the mother was not present at home.

A relative reported to the police.

- The vision was like a horror movie, a relative told Expressen.

The man was taken to hospital.

He had surgery because of his injuries.

Police have arrested the 70-year-old woman on suspicion of deprivation of liberty and aggravated bodily harm, says Expressen.

According to the magazine, the boy was a prisoner of his mother for 28 years.

- Mom had managed to fool society all these years.

It is shocking how the son has been deprived of life, the mother’s relative told Expressen.

A relative told Expressen he had suspected for years that there was something wrong with the apartment.

When he was younger, he told the rest of the family that he thought the woman, now a suspect, had broken her son’s psyche.

However, he surrendered when the family did not respond to his concerns.

According to the relative, the woman must have told her son since his childhood that society and other people are looking for them and that he is the only one who can protect the boy.

According to Aftonbladet, two almanacs hung on the wall of the apartment, one from 1995 and the other from 1996. The apartment was so full of rubbish and goods that only a narrow route passed through it.

- I can not even describe to appear, I'm in shock.

The whole apartment was like a landfill.

It had probably not been cleaned up in decades.

Like straight from a horror movie, a relative who found the boy told Expressen.

The man's blanket apparently served as his sleeping place.

According to Aftonbladet, the mother had behaved “overprotective” due to previous family problems and taken the son out of school when he was 12 years old.

Relatives suspect the mother has kept the son at home behind bars for all years.