The bodies of the girls, all below 11 years and missing since February 14, were found in a well in their native village on February 16 and a complaint in this regard was lodged by their family on February 17.

Though police initially registered a case of accidental death, postmortem conducted on Monday at Bhandara confirmed sexual abuse and murder, police said, adding the case was registered under relevant sections of IPC against unidentified persons.