[Dog]

It was a PG&E vault exploding..

http://www.kcbs.com/PG-E-Explosion-in-Financial-District/2475206

[Cindy]

Adding a link:

http://cbs5.com/local/underground.vault.explosion.2.756320.html

Jun 24, 2008 4:41 pm US/Pacific

“Underground Explosion Shakes SF Financial District”

ARTICLE SNIPPET: “SAN FRANCISCO (CBS 5 / KCBS) An underground explosion at a Pacific, Gas and Electric Co. vault shook the San Francisco financial district late Tuesday afternoon, but caused no injuries, according to the fire department.

The blast took place at Drumm and California streets just after 4 p.m. and jolted guests at the nearby Hyatt Embarcadero.”