11/16/2014 21:10 EST | Updated 01/16/2015 05:59 EST

No bodies found under barn where Glenna Mae Breckenridge says her dad buried boys

Police have found nothing after digging up a barn northeast of Toronto to determine whether aboriginal boys were murdered and buried there decades ago.

Glenna Mae Breckenridge grew up on the farm, and recently took CBC's Paul Hunter to the site where she says her father stashed two of the bodies after killing them in front of her on their family farm in 1955.

Investigators carefully began excavating the ground under the barn of the Cannington, Ont., area farm on Thursday, but the only item located was a boulder, Durham Regional Police said on Sunday. There were no human remains.

Breckenridge told CBC News that she suffered physical and sexual abuse at the hands of her father and blocked out the memory of the attacks for years.

"He told me if I ever said anything, I wouldn't live to tell the tale," Breckenridge said in a documentary that aired earlier this year on CBC News. "So here I am, telling."

Breckenridge says the first boy was killed after he stumbled across her father sexually assaulting her in a field. The day after, two other boys came to the farm asking after the first, prompting her father to shoot and kill them both, Breckenridge says.

Years later, Breckenridge went to police, but with no missing persons reported and no bodies, the case didn't move forward.

This summer, Breckenridge and CBC News travelled to the farm with ground penetrating radar, which found signs that something was buried under an old pigpen in the barn. The shapes spotted by the radar were located in the section of the barn where Breckenridge said the bodies would be located, but the tools were not able to confirm what exactly was underground.

Last week, CBC News learned that police were digging up the barn. 

Breckenridge's father denied any wrongdoing when contacted by police in the 1990s, saying his daughter was making the allegations up. He has since died. 

Although not considered an active investigation, the file remains open in case new information comes forward.