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Mystery Boom Heard Across San Diego County

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

Photo by Milan Kovacevic

Above: 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."

RELATED: Did You Feel ‘It?’ Not An Earthquake, But Possibly Sonic Boom

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.

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