The JC Penney store at Santa Rosa's Coddingtown shopping center remained closed on Thursday afternoon because of an early morning electrical explosion and fire that cut off power to the store, fire officials said.

It was unclear when power would be restored to the department store off Range Avenue near Guerneville Road, the Santa Rosa Fire Department said.

Fire crews were called to the store at 7:42 a.m. Thursday after a passerby noted smoke coming from the west side of the store, officials said.

An electrical panel in a utility room had exploded and begun burning, sending smoke into the first and second floors of the building, fire officials said.

Crews vented and pumped the smoke from the building to prevent damage to store merchandise, but the store could not be opened until power was restored, authorities said.