Prosecutors in Stockholm said on Thursday that they're closing the investigation and found no evidence of imprisonment in the apartment with a man in his forties was found.

Prosecutor Emma Olsen also told Reuters that the injuries he was found with, such as bruises and sores, could not be attributed to inflicted violence.

Olson says the injuries were due to the man's ill health and that he remains in hospital.

The mother denied all allegations and was released from custody on Wednesday after three days of detention following the discovery of the man in the apartment by a relative.