The United States Geological Survey reports a 5.4 (downgraded from originally reported 5.8) magnitude earthquake this morning at 11:42am. The epicenter is estimated to be two miles southwest from Chino Hills. The USGS provides detailed information on earthquakes by clicking here. Story developing…

The Press-Telegram is reporting that despite at least 10 recorded aftershocks, no major damage has been done citywide, and that positive reports have come back from the Police Department, Fire Department and nearby school districts.  Several buildings were voluntarily evacuated but there have so far been no reported injuries.