MANILA, Philippines?The National Bureau of Investigation (NBI) has pinpointed the web site on which the sex video of Dr. Hayden Kho and actress Katrina Halili was first uploaded, as investigators drew closer to finding the person who posted it.

Sifting through some 50 web sites, on which the sex video continues to be shown, NBI anti-fraud and computer crimes division chief Vicente de Guzman III told the Inquirer that they already knew where the video first appeared on the Internet.

A bureau source, who requested anonymity because he was not authorized to speak to the media, said the web site operator would be treated both as a suspect?for maintaining a pornographic site?and as a witness?to identify the source of the sex video.

He said the bureau had sought the help of a US-based web site host in obtaining the system logs that recorded the Internet protocol address and domain registration of the person responsible for the initial upload.

The NBI investigation has entered its second phase after the bureau recommended to the Department of Justice last week the filing of a sexual violence charge against Kho.

Halili, meanwhile, Monday filed a complaint under the Anti-Violation Against Women and Children Act against cosmetic surgeon Dr. Vicki Belo in connection with the sex video featuring her and Belo?s former beau, Kho.

Halili and her lawyer Raymund Palad went to the Department of Justice to add Belo and two others?Kho?s friends Eric Johnston Chua and Mark Rosario?as respondents in the VAWC case filed against Kho. Jeannette I. Andrade and Norman Bordadora