Thousands of bone fragments were found underneath the home of suspected serial killer Andres (Image: Newsflash)

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Investigators digging under the home of a suspected Mexican cannibal serial killer have found 3,787 bone fragments.

The bones are currently being analysed but initial results suggest they belong to at least 17 different alleged victims of 72-year-old 'Andrés'.

Mexico City police believe the suspect, whose name cannot be disclosed, is thought to have "filleted" his victims so he could consume them.

During a trial where he stood accused of killing the wife of a serving police officer, Andrés admitted peeling the skin off of one of his victims because she "was very pretty".

Andrés made the sickening confession during a four-hour hearing with officials.

The 72-year-old admitted peeling off the skin off the face of one of his victims as she was 'very pretty'
(Image: SSEdomex/Newsflash)

"The bones fragments are being subjected to 'lateralisation studies, which include carefully cleaning each one, identifying what part of the body they are and then placing them in their anatomical position, providing a method for determining the approximate number of victims," prosecutors said in a statement.

"This analysis indicates that, up to now, the bone fragments found may possibly be those of 17 people."

During initial excavations carried out since May 17, investigators have dug up the floors of the house where Andrés lived.

During initial excavations carried out since May 17, investigators have dug up the floors of the house where Andrés lived
(Image: Newsflash)

The 3,787 bone fragments are alleged to have belonged to at least 17 victims
(Image: Newsflash)

Cops now plan to extend the search to the soil beneath several other rooms he rented out on the same property.

Identity cards and other possessions from people who disappeared years ago were found at the rubbish-filled home, suggesting the trail of killings may go back years.

Police have not released the full name of the suspect under Mexican laws protecting a suspect's identity.

Andrés has been ordered to stand trial in the killing of his last victim, a 34-year-old woman whose body he allegedly dismembered with a butcher's hacksaw and knives on May 14.

He brought suspicion on himself due to his alleged last victim – the wife of a police commander whom he knew personally.

Andrés was to have accompanied the victim on a shopping trip the day she disappeared, so her husband suspected him when she failed to return.