Both cells and landlines have been shaky in the minutes after the earthquake hit. That could be due to lots of folks trying to make calls and overloading the system. Given the shallowness of the quake, and the resulting nerve-rattling, those calls might have been even more pronounced. It's a magnitude-5.8 earthquake, about 2 miles southwest of Chino Hills and about 5 miles southeast of Diamond Bar.
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