NAPA, Calif. -

The strongest earthquake in 25 years struck Northern California early Sunday, injuring more than 100 people, damaging historic buildings in downtown Napa and turning fireplaces into rubble.

The 6.0-magnitude quake struck just six miles southwest of Napa, California's famed wine country.

All but six of the injured were treated and released from the emergency room at Queen of the Valley Hospital, said its president, Walt Mickens. They mostly suffered bruises and lacerations, he said.

Six patients sustained critical injures, including a young child, Mickens said.

The child was hurt when a fireplace collapsed and has been airlifted to UC Davis Medical Center, hospital spokeswoman Vanessa deGier told CNN.

Only one patient is still in critical condition, said Walt Mickens, the president and CEO of Queen of the Valley Medical Center.

Mickens said that 172 people have been seen by the hospital's emergency room, though he could not confirm that all of those seeking treatment had injuries resulting from the earthquake.

More on this breaking story is here.

Stay tuned to NewsChannel 5 and kionrightnow.com as this story continues to develop.

Did you feel the quake? Drop us a line at newstips@kionrightnow.com.