Police in Waterville, Maine say a body was found late Wednesday afternoon in the basement of the home of a missing 29-year-old woman. A positive ID has not been made but the woman's boyfriend remains behind bars.

Police say Melissa Sousa was last seen Tuesday morning when she put her twin daughters on a school bus near her home.

Sousa's boyfriend, 28-year-old Nicholas Lovejoy, was arrested early Wednesday. He is being held at the Kennebec County Jail on charges of having a loaded rifle in his vehicle and endangering the welfare of the 8-year-old girls, who were left home alone.

Kennebec County Jail, Risto Viitanen/Thinkstock

Officials say the body was removed from the home Wednesday night and was transported to the state Medical Examiner's Office in Augusta. The Medical Examiner will now work to make a positive identification and determine the cause of death.

Maine State Police and the Waterville Police department are investigating.

We'll have for information as it becomes available.