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A 3-month-old baby died in Houston this week after being left alone inside a hot car, officials said. The exact circumstances surrounding the incident are under investigation and the infant's cause of death is still being determined by the medical examiner's office, according to the Houston Police Department.

Authorities were called to a Houston address just before 3:30 p.m. on Tuesday, where they found a 3-month-old boy unresponsive, Houston Police Assistant Chief Yasar Bashir said at a . The infant was pronounced dead at a local hospital.

"We learned, very sadly, that the child was left unattended in a vehicle," Bashir told reporters. 

He could not say how long the infant was inside the car or whether any of its windows were rolled down during that time. The infant was originally found by the mother, who was not identified by name. Bashir said the mother "was visiting" but did not provide more information.

The incident reportedly happened outside a Houston mental health clinic, where the infant's mother was inside with a 4-year-old child, CBS affiliate  reported. The mother reportedly entered the clinic some time after 12 p.m., according to the station.

Homicide detectives with the Houston Police Department are involved in the investigation. While Bashir spoke at the news conference, he said detectives had returned from the hospital to the scene of the investigation to interview witnesses. The infant's mother and father, who was not there when the baby was found, were both at the scene by then and cooperating with authorities, according to Bashir. The mother was accompanied by a 4-year-old child, he said.