A preliminary 2.5 magnitude earthquake struck in Contra Costa County, according to the United States Geological Survey.
The quake, which hit at 4:45 p.m. Thursday, was centered near Pleasant Hill, the USGS said.
Earlier in the day, a string of temblors struck in the Hayward area.
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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