A small underground explosion in downtown Oakland this afternoon was caused by a PG&E equipment failure, a PG&E spokesman said.
A loud noise and smoke came from under the street at 1951 Webster St. at around 5 p.m., PG&E spokesman J.D. Guidi said.
The cause was an underground cable failure, Guidi said. The explosion did not cause any injuries, and no one lost power.
A power outage was prevented by a second transformer underground that could support the extra load in the event of an equipment failure, Guidi said.
Crews were making repairs this afternoon and will return to make full repairs on Thursday.