A 9-month-old boy died in Lowell after being left in a car as temperatures reached the low 80s Saturday afternoon, the Middlesex district attorney’s office said.

The baby’s father discovered the boy in the family vehicle and called 911, said Jessica Venezia Pastore, a spokeswoman for the district attorney. She said the death initially appeared accidental, but an investigation is ongoing.

No one has been charged, said Pastore, who declined to speculate on the possibility of charges. Lowell police responded to the car on Huntington Street, about three-quarters of a mile southeast of downtown Lowell, and found the baby unresponsive. He was transported to a hospital and pronounced dead, Pastore said.

Pastore said the child had siblings, but couldn’t release any other information about the family at this time. She would not say whether they lived on Huntington Road.

On Saturday night, a small group of people, some identifying themselves as relatives of the baby, gathered on the front porch of a three-family home on Huntington Street.They declined to comment.

Crime scene tape cordoned off a side street by the home.

Across the street, Harold Cruz, 28, sat on the front stoop of his home. He said he had been sitting there at around 3:30 p.m. when he saw an ambulance, a fire truck, and police cars pull up. When he walked over to see what was happening, he said, he saw emergency workers trying to revive the baby on a stretcher. Cruz said he did not know the family.