Days after RCMP and firefighters were called to a fire in a home outside of a central Alberta community, and three people were unaccounted for, investigators said human remains had been found inside.

RCMP told CTV News that remains had been discovered in the home located just outside of Castor, Alberta – however, it was not clear where or how many sets of remains were found.

The remains have been taken to the Medical Examiner in Calgary, where an exam is expected later in the week.

Police and fire crews were first called to the fire between 7 and 8 a.m. Sunday, December 8.

A witness told CTV News that the home was fully engulfed in flames at about 6:30 a.m., when he called 911.

The witness also said the son of the couple who owned the home said his parents and sister had been inside at the time, identified as Gordon and Sandi Klaus and their daughter Monica – all three are presumed dead.

The fire continued to burn for several days, finally, investigators were able to gain entry to what was left of the home Wednesday.