Paranormal investigators in California say they have collected 130 recordings of ghostly voices from the Del Mar Fairgrounds grandstand.

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South Coast Paranormal, a group of San Diego-based ghost hunters, said they have been collecting recordings for their ongoing investigation from the fifth floor of the building since April 2010, when they were called in by Linda Zweig, a spokeswoman for the fairgrounds since 2001, The San Diego Union-Tribune reported Monday.

"We believe it's voices from the disembodied," David Walters, an investigator with South Coast Paranormal, said of the recordings.

However, Joe Harper, chief executive of the Del Mar Thoroughbred Club, said he is skeptical.

"I have never seen a ghost here, but I have seen quite a few people who I thought had died," he said. "And, of course, a number of folks that looked as if they had died."