Vercheesa Thompson called 911 when her 4-year-old-daughter, Kyeesha, suffered uncontrollable seizures and stopped breathing. The fear that she had lost her youngest child was overwhelming, and all Thompson could do was shout out her address, unable to remain calm, as the operator asked.

Terrified, she ran outside her apartment onto Adams Street in Dorchester, knowing Boston police regularly use it.

“Thank God, the first car I see was a [police] wagon,’’ she said. “They put it in park, and they jumped out right away.’’

With Thompson showing them the way, two officers ran to her second-floor home and into the front bedroom, where Kyeesha lay still in her bed. The officers performed CPR and restarted the child’s breathing.

“I am over here freaking out,’’ Thompson said Tuesday as she recounted the incident, which unfolded about 8 p.m. Saturday. She remembered shouting, “Please let my baby live! Please let her come alive!’’

The officers said they had feared for the worst once they arrived. The girl looked in rough shape. “She wasn’t breathing,’’ said Officer Thuan Lai, who has two young children. “Her eyes were open, her mouth was open.’’

Officer Vladimir Levichev knew he had to take great care with CPR. If he pressed too hard, he could break ribs. Too light, and the pressure might not resuscitate the girl. “She took her first breath, and I wasn’t sure if my mind was playing tricks. Then she took another one. It made my day.’’

Thompson recalled seeing someone else arrive, then run out, holding her daughter in his arms. “They whisked her away,’’ Thompson said.

She rushed to the street to join her daughter but realized her 11-year-old son would be left behind. Police reassured her they’d bring the boy to the hospital. “Don’t worry,’’ an officer said. “He is coming with us.’’

On Tuesday, officials filled in some details. The child was helped initially by the two officers and then by firefighters from Ladder 7 who provided oxygen and took over the CPR.

Next an Emergency Medical Services crew grabbed the child and ran to an ambulance.

“This was a team effort,’’ said Fire Department spokesman Steven MacDonald. He said the firefighters did not want to be interviewed out of concern that the conversation would improperly disclose medical information about the patient.

The police officers said they had never participated in such an operation and credited the rescuers from other agencies.

Levichev said the day “went from zero to 100 miles per hour in a matter of seconds.’’ Their next call was for a residential alarm: business as usual.

Kyeesha is recovering at Boston Children’s Hospital. Thompson said she was moved out of intensive care and shows no negative signs from the episode of inexplicable seizures.

Thompson called both of her children “miracle children,’’ because both were born at just over 25 weeks. Three other children did not survive their premature births, she said.

“I would tell the officers, ‘Thank you!’ and I would probably want to give them a hug,’’ she said. “The police really gave my daughter back.’’

John R. Ellement can be reached at ellement@globe.com, Andy Rosen at andrew.rosen@globe.com.