An explosion in an underground utility vault sent a manhole cover flying and left smoke coming from the hole Wednesday morning on B Street in downtown San Diego. Photo via OnSceneTV.

An underground explosion sent a manhole cover flying and damaged the foundation around the utility vault Wednesday morning in downtown San Diego, the San Diego Fire-Rescue Department said. There were no injuries.

The explosion shut down B Street near San Diego City College about 10 a.m. Wednesday while authorities tried to determine what had happened.

“It may have been some kind of buildup of gasses that could have caused the explosion and the cover to be dislodged,” Battalion Chief Chuck Adams said to OnSceneTV.

The manhole is a San Diego Gas & Electric access hole to its utilities, as well as part of the city sewer system. Adams said there was no work going on at the time of the explosion.

According to Adams, a passerby saw the manhole cover go flying and smoke coming from the manhole.

B Street between 15th and 17th streets, as well as the B Street offramp from Interstate 5, was closed while SDG&E investigated the incident.

— Staff report

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