The serial killings of children in Noida revealed a "butcher-like precision" in the chopping of 17 bodies of which 11 have been identified as that of girls, top doctors of the government hosptial in Noida said.

The post-mortem of the skeletons recovered from the house of businessman Mohinder Singh Pandher, who along with his servant Surendra had allegedly sexually abused the children before murdering them, showed that there was a pattern in the killings.

"The manner in which they were killed reveals that those behind the murders has some kind of expertise in this. All the victims have been killed by being slashed at the same point between the two vertebrae," a senior doctor at the Civil Hospital said.

That 11 skeletons were that of girls were identified on the basis of the length of the hair found on their skulls. The hair length ranged up to 40 cm. Six were identified as that of boys.

"Significantly, none of the bones examined were fractured and this points out to the expertise of the murderers," the doctor said.

Asked about the organ trade angle, sources said they could not "completely" deny it as the trunks of the bodies have not been found. "All vital organs, including liver, spleen, and heart were missing and we cannot rule it out completely," the doctor said.

The Chief Medical Superintendent of the Civil Hospital Vinod Kumar said they were not able to identify the remaining six skeletons recovered so far.

Also, 42 bones dug up from the drain near Pandher's house could not be matched.

Senior Superintendent of Police (Noida) R K S Rathore said police will analyse the post-mortem reports in detail and consult the doctors as part of their investigations into the case.

"We will ask them about the findings like what do they mean by butcher-like precision," in the killings, he told PTI in Noida.

The post-mortem of the skeletons recovered from Pandher's house showed that there was a pattern in the killings.