MARLBOROUGH — Police are investigating the death of an infant who was inside a house where two young adults were found unresponsive just before noon on Thursday, the Middlesex district attorney’s office said.
Police responded to a 911 call at 11:48 a.m. for a report of an unresponsive baby and two adults, prosecutors said in a statement. The child was transported to an area hospital and pronounced dead, the statement said. The two adults, identified only as a 19-year-old woman and a 23-year-old man, remain hospitalized.
State Police assigned to the district attorney’s office are also investigating, which is customary in all child death cases, prosecutors said.
The state Department of Children and Families is investigating as well, spokeswoman Andrea Grossman said.
Investigators left the house on Harrison Place around 8:15 p.m. They wore gloves and carried multiple evidence bags. The white house with red shutters was sealed off with police tape, and a blue compact car was located within the perimeter. Potted plants and plastic swans were visible in front of the well-kept residence, which is located on a side street.
Shortly after 9 p.m., a small group of people returned to the house where the infant was found. They did not speak to reporters and did not answer a knock at the door. A small sign was visible on their front porch that said, “Angels.”
The emergency at the home stunned neighbors. Anna Rumsey, 63, said her adult daughter saw a woman running down the street, screaming: “My baby! My baby!”
Police later pushed a young woman, who appeared to be in her late teens or early 20s, out of the house on a chair, Rumsey said.
Rumsey said her daughter also saw a young man walk out of the house in handcuffs.
Rumsey said that she does not know the people who live in the house, and that different people have cycled in and out of the residence recently.
A man who lives across the street described the family as “church people” and said the young woman gave birth recently.
“It’s very sad what happened,” said the man, who would only give his first name, Angel. “Very sad.”
Asked if he was aware of any problems the family may have been having, Angel said the young mother and her boyfriend “had their arguments, like every couple.. . . But other than that, nothing.”
Nicole Soo, 30, said she could not recall a single prior disturbance in the three years she has lived on the street.
“It was definitely shocking,” she said.
Another neighbor, Jasmine Benites, 20, said she graduated high school with the mother of the deceased child. Benites said she does not know the mother well.
Travis Andersen can be reached at travis.andersen@globe.com. Follow him on Twitter @TAGlobe. Samantha Gross can be reached at samantha.gross@globe.com. Follow her on Twitter @samanthajgross