ARROYO GRANDE, Calif. (AP/CBS13) — The latest of many searches in the nearly 25-year mystery of the disappearance of California college student Kristin Smart ended Tuesday with no comment from authorities on whether it yielded any results.

The San Luis Obispo County Sheriff’s Office tweeted that service of a search warrant was concluded at the Arroyo Grande home of the father of former student Paul Flores, who has long been under investigation in the case but has never been arrested or charged.

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“As with any active investigation we will not be commenting on what, if any, evidence has been discovered,” the office said. “No further info will be released at this time.”

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The office announced the search Monday and noted that the use of cadaver dogs and ground-penetrating radar had been authorized.

Smart, 19, a Stockton resident, vanished in May 1996 while returning to a dorm at California Polytechnic State University, San Luis Obispo, after a party. She was seen with Flores, who also was a student at the time.

Arroyo Grande is about 15 miles south of the Cal Poly campus.

Last year, search warrants were served on Paul Flores’ home in the San Pedro district of Los Angeles and at other locations in California and Washington state. Investigators conducted digs on the campus in 2016.

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Paul Flores has remained mum through the years, invoking his Fifth Amendment right to not answer questions before a grand jury and in a deposition for a civil lawsuit that was brought against him.