Newark, Delaware police said the investigation and all surrounding circumstances is now centered in Middlesex County, New Jersey. The Middlesex County Prosecutor's Office is now heading the investigation
The child was abandoned in a gas station bathroom last Sunday.
Richard Sedlak from western Pennsylvania is a power company lineman who was passing through on the way to a job in Maryland. He stopped, intending to use the bathroom at a Shell gas station at 804 South College Avenue, near the University of Delaware. He got a key from the attendant and headed to the door, but heard crying from inside.
"He waited a few minutes, thinking there was a parent and child inside," said Lt. Brian Henry of the Newark Police. "But when the crying continued and nothing else happened he opened the door and found the child inside, alone."
After the child's picture was aired on television, including Eyewitness News, police received tips and were able to identify the girl.
The gas station where she was abandoned has an electronic surveillance system, but it wasn't working, investigators said.
Police say the little girl would not give them her name. She just kept asking for her mother.
The girl remains in foster care in Delaware.