FALMOUTH — The teenage son of a Falmouth couple whose home was destroyed by fire late Saturday is being held without bail after he was arrested on charges of burglary, theft and attempted theft, police said Sunday.

Logan Valle, an 18-year-old former honor student and graduate of Falmouth High School, is accused of forcing his way into two homes on Fieldstone Lane while naked and trying to get keys to steal a vehicle about the same time a fire was reported two miles away in his parents’ home at 12 Inverness Road, Falmouth police Lt. John Kilbride said in a news release.

The State Fire Marshal’s Office is investigating the cause of the fire, which destroyed the upscale Falmouth home, displacing its owners and leaving one of their three dogs unaccounted for.

The office’s spokesman, Stephen McCausland of the Maine Department of Public Safety, would not say Sunday whether Valle was believed to have caused the house fire.

Kilbride said Valle’s car was found near his parents’ home in the Falmouth Country Club parking lot. He said it appeared an attempt had been made to set the car on fire, but it was not successful.

Valle was found in the attic of one of the Fieldstone Lane homes and arrested, police said. He was taken to the Cumberland County Jail in Portland.

No one was hurt in the house fire, which was reported around 10:45 p.m. Saturday by a neighbor who saw flames coming out of the residence.

That was about the same time Falmouth police said they received reports of the burglaries in progress on Fieldstone Lane.

The owners of the house, Valle’s parents Kevin and Lisa Valle, were not home at the time of the fire, neighbors said. The family was staying in a furnished rental home as of Sunday afternoon, they said.

According to town records, the Valle home had an assessed value of $602,000 in 2013.

Except for most of the attached three-car garage, the house was destroyed and was still smoldering Sunday afternoon. While two of the Valles’ dogs escaped the fire and were later found, a third dog, Roxy, was still unaccounted for as of 5 p.m. Sunday. Several of the Valles’ friends and neighbors were out searching the surrounding woods and calling out the dog’s name.

According to Logan Valle’s Facebook page, he graduated from Falmouth High School in 2014 and is now an employee at Hannaford Supermarkets. Press Herald articles from 2011 and 2012 listed him on the high school’s honor roll.