PHOENIX - Outgoing Maricopa County Sheriff Joe Arpaio announced Thursday he and his team had concluded a document presented as President Barack Obama's birth certificate was fake.

During an hour-long press conference, Arpaio and investigator Mike Zullo lamented the coverage they'd received from media outlets about their investigation. They did not answer any questions from the media.

Zullo and Arpaio said their aim was to clear the document rather than to draw into question the place of President Obama's birth, but they claimed the evidence from their five-year investigation never could clear the document.

Zullo introduced a video comparing the Obama certificate to another Hawaiian birth certificate from weeks after Obama's birth, claiming evidence suggested the Obama document had used the other certificate as source material for fabrication.

The video was a side-by-side comparison of the documents, superimposing portions of the the second certificate on the Obama certificate. The video argued that the angles of stamps on the two documents were too perfectly matched.

Zullo then described purchasing a printer and uploading software to the printer in an effort to mimic what he and his team believed had happened in what they claimed was the fabrication of the Obama certificate.

Zullo and Arpaio said their investigation included determinations by two forensic examiners that the document was inauthentic.

Zullo also detailed his trip to Hawaii for documents to confirm the authenticity of the Obama birth certificate, saying technicalities of Hawaii law dictated that validations provided by state officials had covered the information in the certificate rather than the certificate itself.

Zullo said he was not sure where Obama was born or if he was a natural-born citizen before introducing the video comparing the two certificates for a second time.

Arpaio said he would turn over the investigation to the federal government and Congress.