The Rialto Fire Department reported that a series of small earthquakes shook the northwestern portion of the city Thursday morning.

A 4.3-magnitude earthquake shook parts of Southern California, the U.S. Geological Survey reported. The about 3-mile deep quake hit about 4 miles west from Muscoy in San Bernardino County at 9:32 a.m.

LOS ANGELES — A magnitude 4.3 earthquake rumbled through Muscoy in San Bernardino County on Thursday morning, triggering shaking across the Inland Empire region, Los Angeles and Orange counties, according to the U.S. Geological Survey.