LOS ANGELES - A magnitude 4.0 earthquake followed by several aftershocks struck Southern California Sunday morning, according to the U.S. Geological Survey.
The quake was reported about 4.3 miles southeast of Ontario at 3:51 a.m. It had a recorded depth of 5.2 km.
There were no immediate reports of damage or injuries.
The earthquake was followed by nearly a dozen aftershocks, the USGS reported.