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HOPEWELL, Va. (WRIC) – Seven children were rushed to the hospital Wednesday after taking what officials believe to be a prescription medication at a home in Hopewell, Virginia.

Hopewell Police said that three of the children — a 1-year-old, a 2-year-old, and a 3-year-old — are in serious condition. The other four children are expected to be OK.

Police said the woman watching the children called Hopewell Fire and EMS when she realized the kids “weren’t acting right.”

According to police, the fire department arrived and immediately found four children — a 1-year-old, a 2-year-old, a 3-year-old, and a 4-year-old — lethargic and unresponsive but breathing. The other three children were later found in the house, and all were taken to Chippenham Hospital.

The fire department contacted Hopewell Police believing that an overdose or poisoning had occurred.

Officials said some of the children had been dropped off at the house by their mother, who was leaving them in the care of a woman who had other children in the home. Sometime during the day, the woman babysitting left the kids to go to the store, police said.

The woman later told police that she informed another occupant of the house that she was leaving, but admitted that he may not have been clearly instructed to watch the children while she was away. Police have not clarified whether or not the children were home alone.

Police said the woman noticed the children were acting strange when she got back to the house, but did not immediately think anything of it. She then saw an empty prescription bottle lying on the floor and realized the children may have ingested the medication, according to police.

Police have not been able to figure out where the prescription bottle came from, or how the children came to get their hands on it. According to officials, the prescription was not immediately identifiable, as it was an old bottle and the label had been rubbed off.

Authorities contacted Child Protective Services after the incident. The Commonwealth Attorney’s Office was also contacted.