A fourth child, who is only 2-years-old, was also at the home but was unharmed.
Investigators said Williams was arrested and later provided a full confession of how he stabbed and killed the three girls while the kids were sharing a bed.
Three young girls found dead in a Maryland house on Friday were fatally stabbed by an older brother of one of the children, according to Prince George's County police. "We have our evidence techs who are inside the home now".
Antonio Williams, 24, of Clinton, has been arrested on three counts of first-degree murder and other related charges in the slaying of the girls. "We want to assure the community that the Prince George's County Police Department will work tirelessly to find the person or persons responsible for these children's deaths".
Authorities said they are investigating what exactly happened in the home.
"We have many answers, but unfortunately we don't have all of them at this point", Prince George's County police Capt. Anthony Schartner during a press conference Saturday, noting officials are only hours into their investigation.
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Police did not offer much information at the news conference this afternoon.
Cops rushed to the neighbourhood in Clinton, Maryland after an adult family member discovered the bodies, which police say show signs of "blunt force trauma".
"This is one of the most hard scenes that our officers arrived on".
Detectives are working to establish a motive in this case.
Donelan said counseling services are being made available for the officers who first arrived on the scene, and the same may be made available for fire personnel.