Police on Saturday morning identified the girls as Ariana Elizabeth DeCree, 9; Nadira Janae' Withers, 6; and Ajayah Royale DeCree, 6. The Decree sisters were visiting relatives at the time of the incident.
"This is one of the most hard scenes that our officers arrived on", police department spokeswoman Jennifer Donelan said.
The three girls all had stab wounds, and were pronounced dead at the scene.
Williams is charged with three counts of first-degree murder and three counts of second-degree murder. He was being held without bail.
Police said they found a 2-year-old girl, who was unharmed, in the home when they arrived. A motive for the killings was unknown. "We are grieving together", Alsobrooks said, adding that the rash of violence in the county and the country needs to end.
Utkal Express derailment: Northern Railways GM RNKulshrestha sent on leave
The Utkal Express derailment has claimed 23 lives so far. "He will also find out whether laid down rules were followed", he added. In further developments related to the incident, an FIR has been registered against unknown persons, the police said on Sunday.
While details of the children's injuries were not revealed Donelan said they suffered "trauma to the body".
Police were called just after 7:30 a.m. Friday morning to a scene that police spokeswoman Jennifer Donelan referred to as "one of the most hard scenes that our officers arrived on".
"This is one of the most hard scenes that our officers arrived on".
Relatives of the victims are being contacted and counseling has even been offered to officers who responded and found the bodies.
A press conference was due to take place this morning.
"We are so very, very devastated for these young, handsome children and their families", Alsobrooks said.