SAN FRANCISCO (Reuters) - An underground electric transformer exploded in San Francisco's central financial district on Friday, injuring at least one woman and prompting police to close several city blocks, officials said.

"The manhole blew up," said Maria Chapital, an administrative assistant who witnessed the explosion from across the street. "Something blew up under the sidewalk."

"It felt like a truck hit the building," she told Reuters, saying she saw dislodged pavement and flames on the awning of the Ralph Lauren store in central San Francisco.

Windows in the store were also blown out when transformer blew in an underground electrical vault.

"It appears the explosion did occur within the vault. Exactly what caused the explosion we don't know yet," said Paul Moreno, a spokesman for PG&E.


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