This handout photo provided by the Prince George's County Police Department shows a booking photo of Sonya Spoon, who was arrested in the deaths of her two toddlers. (AP)

A 24-year-old woman who is charged with suffocating her toddlers tried to revive them as her mother called Prince George’s County 911 dispatchers for help, according to recordings of the 911 calls that were released Wednesday.

In two frantic 911 phone calls early Sunday, a woman who identified herself as Paivi Spoon told an emergency call taker that she and her daughter were performing CPR on the children after “someone tried to suffocate” them, according to the tapes. Paivi Spoon said four people were in the house, including her daughter and the two children. At one point, the daughter, Sonya Spoon, could be heard apparently counting chest compressions during an attempt at CPR.

Paivi Spoon pleaded with the call taker to send rescue workers to the home in Cheverly, Md. “We have two unresponsive children here,” the maternal grandmother said. “Please come and help. Toddlers.”

Authorities later charged Sonya Spoon with first-degree murder in the deaths of her children: Ayden Spoon, 1, and Kayla Thompson, 3. Investigators said Paivi Spoon found the children unconscious with plastic bags and duct tape around their heads after Sonya Spoon woke her.

“What happened to the children?” the dispatcher asked Paivi Spoon.

A 24-year-old woman, who is charged with suffocating her two toddlers, tried to revive them as her mother called Prince George’s County 911 dispatchers asking for help to perform CPR on the children. (Prince George County Government)

“Someone tried to suffocate them,” she responded.

“Someone tried to suffocate the children?” the dispatcher asked. “Who tried to suffocate the children?”

“We’ll talk about it. Just come here,” Paivi Spoon said and described their efforts to perform CPR on the toddlers.

“My daughter and I are both trying to do this,” she said. Moments later, Sonya Spoon was heard pleading, “Come on, baby. Come on, please.”

Less than a week before the children were killed, police took Sonya Spoon to a hospital for an emergency psychiatric evaluation after she threatened to kill Kayla and to commit suicide.

Sonya Spoon had been involved in several custody battles over the children, according to police and court documents, but authorities said they knew of no motive for the killings.

The audiotapes continued with an operator giving Paivi Spoon instructions on CPR. Later, Sonya Spoon sobbed loudly as her mother told a dispatcher that neither child was breathing. The tapes were released by the office of Prince George’s County Executive Rushern L. Baker III, in response to news media requests.

When authorities arrived at the home, they took the children to the hospital, where they were pronounced dead.