A preliminary 3.2-magnitude earthquake shook the Rancho Cucamonga area Wednesday morning, according to the U.S. Geological Survey.
The quake's epicenter was about 7 miles northwest of Rancho Cucamonga and struck at approximately 5:24 a.m.
It had an estimated depth of about 1.5 miles, according to the USGS.
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There were no immediate reports of damages or injuries.