Montgomery County Police are continuing to investigate the deaths of two children at a Germantown residence Friday — and said officers had been at the residence the night before responding to a call about a child left alone in a car.

Friday at about 9:30 a.m., officers were called to the 19000 block of Cherry Bend Drive after a resident called 911 when they noticed a vehicle with the door open and a knife laying outside of the vehicle.

Police said officers went to a townhouse and found two women and four children — two of the children dead. One of the women fled out a rear door but was taken into custody, police said. The other two children, along with the other woman, were taken to local hospitals for treatment.

Police said they determined that officers had been dispatched to the same residence Thursday night after a resident reported an unattended child in a car. In that incident, police said the child had been removed from the car before they got there, and when officers attempted to speak with the residents, there was no response at the door. Montgomery County Child Protective Services was notified and was asked to follow up, police said.

The department said that detectives have determined one of the women in the house is the 28-year-old mother of all four children. She was taken into custody. Police said the other woman, 21, is not believed to be a family member but may have lived at the residence.

Police have not released identities of those involved. Anyone with information may call detectives at 240-773-5070 or Crime Solvers at 1-866-411-TIPS.

This story has been updated.