(CNN)[Breaking news update, published at 1:38 p.m. ET]
Investigators have found "absolutely nothing" to substantiate a report that gunshots were fired in the basement of Naval Medical Center San Diego on Tuesday morning, Navy Capt. Curt Jones said.
However, authorities still are going though the building, and it will take a long time to finish their search, he said.
He said he'd characterize the person who made the report as "someone who thought they heard something and made reports."
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