When a Japanese man was baffled as to how food kept disappearing from his kitchen, he decided to set up a hidden camera which found something quite unsettling.

The 57-year-old unemployed man of Fukuoka in southern Japan called police Wednesday when the camera sent pictures to his mobile phone of an intruder in his home while he was out on Wednesday, the Asahi newspaper said on its Website.

Officers rushed to the house and found a 58-year-old unemployed woman hiding in an unused closet, where she had secreted a mattress and plastic drink bottles, the Asahi said. Police suspect she may have been there for several months, the paper said.