OXFORD — For the second time in a month, the Maine Fire Marshal’s Office has ruled that a house on Jenny Lane was the target of arson.

Investigators determined Thursday that an “intentional human element” was involved in the fire that destroyed the single-story ranch dwelling at 67 Jenny Lane on Wednesday, Sgt. Joel Davis said. The office previously ruled that a fire that damaged the residence on June 4 was arson.

Davis said investigators knew how and where the fire was started, but they were not releasing that information Thursday.

“We have people that we’ve interviewed, and the investigation is ongoing,” he said. “We haven’t really narrowed the focus at this point.”

The June 4 fire was started on the rear porch of the house, which is owned by Barry and Carol Laufer. The couple was home at the time of that fire, but woke after smelling smoke and left the house. Damages from that fire were repaired as the Laufers prepared to sell the house and move out of the area.

No one has been charged in the June 4 arson. During the investigation into that blaze, investigators questioned 34-year-old Robert G. Conrad of Western Avenue in South Paris and arrested him in relation to a different fire. Conrad’s girlfriend told investigators that he burned a Country Club Road house belonging to Robert Walker in March 2007.

The Laufers, who were preparing to close a sale on the house Wednesday, were not home when the second fire was set at about 8:20 a.m. that day. The house was considered a total loss.

Chief Scott Hunter of the Oxford Fire Department said the fire was considered suspicious because it was the second one at the residence. Investigators worked to determine whether there may have been an accidental cause, he said.

Anyone with information about the fire should call the Fire Marshal’s Office at 624-7076.

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