Southern California was hit hard by a 6.4 magnitude earthquake on Thursday.

Tremors were still being felt on Friday as emergency respondents rushed to provide medical assistance and fight fires that broke out as a result of the earthquake.

The earthquake was the largest that the state has seen in two decades. The tremor was near Ridgecrest, a small city 150 miles north of Los Angeles. The quake was felt as far away as Los Vegas and in most of California. The tremor started at 10:33 AM local time during the Independence Day holiday, with magnitude 5.4 tremors being recorded at 4:15 AM on Friday.

Ridgecrest, which is located just southwest of the tremors’ epicenter, experienced significant damage. Power lines were knocked down, roads cracked, and broken glass from buildings fell onto the ground. The walls of some homes fell to the pressure of the earthquake, but the epicenter was fortunately far away from major population centers. The Ridgecrest Regional Hospital had to be evacuated and the Kern County Fire Department reported responding to almost two dozen incidents including minor medical emergencies, some of which resulted from burns. The US Navy’s China Lake facilities were also subjected to serious damage, with AFP news reporting water leaks, fires, and spills of hazardous materials.

California Governor Gavin Newsom declared an emergency in the areas affected by the earthquake, as fears of more aftershocks didn’t let up in the earlier hours of Friday morning. During several interviews, Newsom urged California residents to be prepared in case more earthquakes hit the state.