A preliminary 2.9 magnitude earthquake struck Saturday afternoon near San Ramon in Contra Costa County, according to the United States Geological Survey.

The temblor was reported just before 2 p.m., and was centered about 2.5 miles east of San Ramon, the USGS said.

Further information was not immediately available.

_This is a developing story. Details may change as more information becomes available. Stay tuned for updates._

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