BROOKLIN, Maine — A fire of undetermined origin heavily damaged the Folly Road home of the town’s tax collector Tuesday morning.

Sharon Freethy was at home when the fire broke out, and she called in the fire from a neighbor’s house at 6:12 a.m., according to Brooklin Fire Chief Sam Friend.

Firefighters responded quickly, but the double-wide mobile home already was about 40 percent involved, making the blaze difficult to fight, Friend said.

With mutual aid from Sedgwick and Blue Hill, firefighters made an aggressive attack inside the building.

“We were unable to get the knockdown we wanted and were forced to back out,” he said. “The building was losing its integrity and so we had to move outside to a defensive attack.”

The mobile home had a small attic and the fire burned into that area.

“It got up in the attic and that let it go the whole length of the mobile home,” he said. “That made it tough for us to contain it to one area. It kept jumping around on us.”

Firefighters had the fire under control by 6:45 a.m., but Friend said the home was heavily damaged and was a complete loss.

No one was injured in the blaze. A representative from the Pine Tree Chapter of the American Red Cross has met with the family and provided them with assistance for replacement of clothing, food and household items

The fire started in a bedroom, but Friend said they have not yet determined the cause. That is still under investigation, he said, and an inspector from the State Fire Marshal’s Office is expected to examine the scene today.

Thirty to 40 firefighters from the three departments responded to the call.