What happened in the 48 hours from the time Carlee Russell made a call to 911 reporting a toddler walking on a Hoover interstate until she walked to the door of her parents’ home remains a mystery.

Police say they are continuing to retrace the 25-year-old nursing student’s steps to determine where she was from Thursday night until Saturday night. Her parents say she was abducted and fought for her life.

AL.com obtained recordings of police dispatch calls from the time Russell called 911 until a large crowd gathered outside her Hoover home following her safe return that illustrate the police response throughout the ordeal.

Hoover police did not release the law enforcement radio communications and have not released Russell’s 911 call because of the ongoing investigation.

It began Thursday night at 9:34 p.m., when police received a 911 call from Russell stating she had seen a white, male toddler in a white t-shirt and a diaper.

Hoover officers quickly arrived on the scene and found Russell’s red Mercedes, but saw no sign of a toddler or Russell.

“Call the RP (reporting person) back. She’s not with her vehicle,’’ one officer said.

“Be advised, her vehicle is unlocked, running, all her personal belongings except her phone,’’ the officer said.

Officers ran the car’s registration and found that it was registered to Russell.

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911 operators tried to call her back but got no response.

“We’re not getting the female to answer,’’ an operator said. “We’re trying to call her back. She’s not answering.”

“Can you give me a description of the child? Were they southbound? Walking southbound?” an officer said.

“The RP had just seen a child walking on the interstate and had gotten out with it when she disconnected,’’ according to police radio communications.

“If we can, can we start a unit to (inaudible) to see if this child might have wandered from a house over there?’’ an officer said. “See if we can find her.”

The officers also talked about sending police to Russell’s family home in Hoover, “to try to make contact there.”

Another officer said, “I believe we located her. We got a call about a female screaming with a child…Be advised, the female screamed and the line disconnected.”

“Where exactly is that call coming from?”

“The call is pinging from that location.”

“We’re at …. Atkins Trimm Lane checking the back yard….Do you want to see if we can start getting her (Russell’s) phone pinged?”

“That’s 10-4, start pinging her phone.”

“We’re trying to get T-Mobile to ping the phone.”

“I’m not sure if you have this info already, but apparently there was a sister who was on the phone with her and still has an open line with her phone and can hear the vehicle on the side of the interstate or something.”

“The first call we got was from her. The second call we got was from the family.”

“Right, I’m just saying the sister apparently has an open line from that phone still.”

Officers talked about bringing in a drone and checking IM’s from Facebook. Shortly after 10 p.m., they called for an evidence technician to come to the scene.

A police staging area was set up at The Grove as at least two drones were brought in to help with the search.

Star 1 — the Jefferson County sheriff’s office helicopter — was also called, but was not able to fly.

A statewide lookout bulletin was issued for a “possible abduction.”

That BOLO – with special attention directed to Bessemer, Jefferson County, McCalla and the Tuscaloosa area — read, in part, that “personal belongings including cell phone were just located around Exit 1 on 459.”

Other calls capture the moment when Carlee Russell’s family shortly before 7 p.m. Saturday reported they had received a call from her saying she was at Red Roof Inn in Vestavia Hills.

“The front, per caller, said family members at this location saying they received a call from the female that’s missing, Carlee Russell, saying she was at this location,” a dispatcher said.

“I spoke with the front desk clerk. They said the family’s not being (inaudible) or anything like that, but that there was about six carloads of people that have just shown up over there,” the officer replied.

Dispatcher: “Did the front desk have anybody check in under that name?”

Officer: “Negative, and according to the front desk, the message the family got did not state which Red Roof Inn. They don’t know if it’s going to be Vestavia or another location.”

Hours later, at 10:44 that night, the Hoover 911 center received a call from Carlee’s residence that she had returned home on foot.

“Nunnally Pass, police are en route, unresponsive female is breathing,” a fire department dispatcher said.

“Be advised, I’m 23 (on scene), we’ve got a large crowd out here in the street,” a first responder replies.

“We should have all the family members that were here on the front porch,” an officer then said.

At 11:02 p.m., a dispatcher noted Russell was en route to UAB by a rescue unit with additional medics.