UPDATE: No evidence of shooting found in Naval Medical Center in San Diego

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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.”

Initial reports

Gunfire was reported Tuesday morning at the Naval Medical Center San Diego, the Navy said, prompting the center to urge people to stay away as police responded.

One witness reported hearing three gunshots in the basement of the center’s Building 26, a combination gym and barracks building, at about 8 a.m. PT (11 a.m. ET), Navy spokesman Kevin Dixon said.

The incident was treated as an active shooter situation, center spokesman Mike Alvarez said. ┬áMilitary and local police were going through the building. The center, on its Facebook page, said that “all occupants are advised to run, hide or fight.”

There were no immediate reports of anyone injured.

Naval Medical Center San Diego bills itself as the largest military healthcare system in the western United States. Situated on 78 acres surrounded by San Diego’s Balboa Park, the center has a 272-bed hospital, eight clinics for active duty personnel and nine primary care sites for their family members.

The center had more than 1.2 million outpatient visits in 2014, admitting more than 19,000 patients that year. The hospital offers a comprehensive array of medical services, including births.

A middle school and two high schools in the vicinity were locked down as a precaution, the San Diego Unified School District said.

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