Approximately 2,100 PG&E customers in San Francisco are without power this morning, a utility spokesman said.

The outage began at about 1:05 a.m. and is primarily affecting customers in the city’s South of Market and Mission districts, PG&E spokesman J.D. Guidi said.

Utility crews are en route and have not determined the cause of the outage.

There is no current time estimate for restoring power, Guidi said.

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