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.

A preliminary magnitude-4.3 earthquake in the San Bernardino area produced shaking that was felt over widespread parts of Southern California. The quake, reported at about 9:30 a.m., was one of four of magnitude 2.