An investigation into the remains of three babies found in a London, Ont. home this past month is running into difficulty, according to local police, after an autopsy on the bodies found the children died between December 2001 and June 2009.

London Police Chief Murray Faulkner said the babies' remains were transferred to Toronto for forensic testing on June 10 and that it will probably take months to determine how the babies died and their gender.

Initial tests show that at least two of the infants were near full-term when they died.

However, pathologists believe there is no sign of trauma to the bodies though they are dealing with an advanced state of decomposition.

"This case has lots of particular twists and turns," he said. "One of the problems with the case is that it likely occurred over a long period of time. That's part of the problem with this whole case," Faulkner said.

The remains were found on June 9 inside a box packed away in a London home. The bodies were so severely decomposed that at first, police thought they were the remains of one child. An initial autopsy confirmed it was three babies.

Jennifer Sinn, a former resident of the home, is facing three counts of causing an indignity to a body and three counts of disposing a child's body.

The 32-year-old woman resided in Brampton, Ont. until moving to London in 2008. She lived in the London home where the remains were found for about six months.

Faulkner said the box holding the remains made it from Brampton to London.

"That is definitely what happened in this case," he said.

Faulkner also said the investigation is far from over and that police are awaiting further results from the autopsies. They are also looking at "the full circumstances" related to when the children died.