NEW YORK -- Tulsa police have identified a person of interest in the creepy case of a Craigslist ad posted to the site on Jan. 2, thanking public officials for the writer's "first kill" and saying Oklahoma City might be next on the writer's slaughter list.

"I was wanting to thank Tulsa for letting me have my first kill," it read, adding that the crime was "stranger on stranger so the police will have a difficult time" and pledging that "it will not be my last."

Specifically, the ad thanked Julie Free, of the Department of Corrections, and Judge Glassco, who works in the probate division of the Tulsa County District Court as "the people who started it all."

Get Breaking News Delivered to Your Inbox

Free is a probation parole officer who mainly supervises sex offenders, he said, and Glassco works in the criminal court's parole division.

According to Sgt. Dave Walker, who works in the homicide unit of the Tulsa Police Department, sex offenses are the "common denominator linking the two" officials.

He said authorities believe that the claims are fictitious and were posted by a man who has been involved in the criminal justice system, either from a location in California or Texas.

Nobody had been taken into custody Friday afternoon.

"We don't have a stranger-on stranger kill" or anything related to the murders described, Sgt. Walker said, adding "On face value, it looks like a hoax."

Sgt. Walker said it's not clear what, if any crime, had been committed and he said that it might be pursued as a "computer-type-crime" when all the facts are laid bare.

Police initially learned of the posting from a news reporter the same day it went online, and they subpoenaed Craigslist for information that might lead them to the poster. Information the company provided has aided the ongoing investigation, Sgt. Walker said.