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Explosion rocks downtown San Francisco

Declan McCullagh Former Senior Writer
Declan McCullagh is the chief political correspondent for CNET. You can e-mail him or follow him on Twitter as declanm. Declan previously was a reporter for Time and the Washington bureau chief for Wired and wrote the Taking Liberties section and Other People's Money column for CBS News' Web site.
Declan McCullagh

An explosion in San Francisco's financial district a few blocks from News.com's offices shattered windows and alarmed downtown shoppers.

It wasn't entirely clear what caused the 10 a.m. blast, but by early afternoon police were saying that an underground electrical transformer was the most likely culprit.

Police quickly blocked off about seven square blocks of the downtown area near the intersection of Post and Kearny, and soon crowds were gathering to catch a glimpse of the blast scene.

We've posted a photo gallery of the scene taken around 11 a.m.