SAN FRANCISCO (KGO) -- Streets are closed until further notice at the intersection of Third and Mission streets in San Francisco due to a PG&E vault fire.
San Francisco firefighters responded to calls of heavy smoke in the area just before 2 p.m. on Tuesday.
When they arrived they determined it was an underground electrical equipment fire.
PG&E utility crews are currently investigating what may have caused the fire to ignite.
Fire officials tell people to seek alternate routes.
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