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Public Safety

Mystery Boom Heard Across San Diego County

San Diego's skyline is shown in this undated photo.
Milan Kovacevic
San Diego's skyline is shown in this undated photo.

A loud noise was heard across San Diego County Tuesday evening, but it was unclear what caused the boom.

It occurred around 8:15 p.m. and residents, including San Diego Mayor Todd Gloria, took to social media to report hearing the boom.

"Yes, I heard it," Gloria wrote on Twitter. "No, I don't know what it was. I'll share if I get any information."

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There were no reports of an earthquake occurring in the region at that time, according to the U.S. Geological Survey.

Camp Pendleton posted on its Facebook page June 3 that artillery units were scheduled to conduct live-fire training from Saturday through Friday and explosive munitions fire was expected between 6 a.m. and midnight each day.