Joran van der Sloot, the main suspect in the 2005 disappearance of American Natalee Holloway in Aruba, has made a second confession, according to Dutch newspaper De Telegraaf.

The confession reportedly came after Van der Sloot gave an interview to a German TV station.

According to the report, Van der Sloot said Holloway's body was hidden in marshes on the Caribbean island. Van der Sloot made the comments to German broadcaster RTL and a second interview is reportedly plannedin Frankfurt this week. In an earlier confession he told reporters he dumped Holloway's body at sea.

He has also claimed in the past that Holloway died accidentally and insisted that he did not kill her.

Aruban justice department officials doubt Van der Sloot's latest confession, telling De Telegraaf that although it has sparked new inquiries into the investigation, "it soon became clear this statement is a mixture of lies and fantasy."

Aruba's chief prosecutor Peter Blanken told NBC News that the suspect's story was "very unbelievable."

SLIDESHOW: Missing in Paradise.

A justice department spokesman told De Telegraaf that if Van der Sloot were telling the truth he would name the exact spot where Halloway's body is hidden.

Van der Sloot is thought to be in the Netherlands, where he attended his father's funeral last week.

Holloway, from Mountain Brook, Ala., was 18 when she was last seen leaving a bar in the Aruban capital in 2005 on the final night of a high school graduation trip. No trace of her has ever been found.

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The Associated Press contributed to this report.