The West Valley City Fire marshal said he hopes to determine late Monday the cause of a fire that caused $30,000 damage to a West Valley home and killed a family dog.

Capt. John Blundell said Monday morning that investigators "still have some unanswered questions," but he expected the investigation to end soon.Three fire departments responded to the blaze at 2506 S. 1160 West about 1:52 p.m. and found smoke pouring from the home, said West Valley City Fire Battalion Chief Moose Barkdull.

The fire started in the basement and spread to the main level, badly damaging a bedroom and back portion of the house and causing extensive smoke damage in the rest of the structure, Barkdull said.

Four children were home when the fire started but escaped without injury, he said. The family dog was found dead behind the front door where it apparently was trying to escape, Barkdull said.

West Valley City, South Salt Lake City and Salt Lake City fire crews responded to the blaze and brought it under control in ten minutes, Barkdull said.