NORWAY – The State Fire Marshal’s Office investigation into whether five recent fires in the Oxford Hills area may have been the result of arson has been extended to include other unresolved cases.

“We’re working on the fires and some fires from years ago that were unsolved,” chief investigator Richard Shepard said Monday.

Arson is suspected in the March 13 fire that destroyed the Country Club Road home of Selectman Robert Walker.

Investigators said an accelerant helped fuel the blaze. That finding prompted investigators to go back over a string of other recent fires that were initially thought to be accidentally ignited.

Investigators are looking again at the cause of fires at a Main Street boarding house in Norway, an apartment over a closed restaurant in Paris, a mobile home in Oxford and a log cabin office at Camp Susan Curtis in Stoneham. The fires, which all occurred since early February, left dozens of people homeless, killed at least five pets and destroyed hundreds of thousands of dollars worth of property. All were initially ruled accidental.

Shepard said the investigation is being extended to include previous unresolved fires in the area from years ago. He declined to elaborate on where or exactly when those fires took place.

“It’s an ongoing investigation,” he said.

Shepard said that as of Monday he can only rule out the fire at a Paris log home from the list. Shepard, who investigated that fire firsthand, said he still has no reason to believe the cause was anything other than accidental.

A couple narrowly escaped the early morning blaze on Nichols Street that killed three pet cats when overloaded circuits ignited the blaze.

Anyone with information on any of the fires should contact the State Fire Marshal’s Office at 626-3870, or the Maine State Police barracks in Gray at 482-0730.