A mother was killed and six people were taken to hospitals, including the dead woman’s two children, in a crash on the Baltimore-Washington Parkway in Anne Arundel County Friday, authorities said.

The mother and driver, Katherine K. Grooms, 41, of Fort Washington, was pronounced dead on arrival at the Maryland Shock Trauma Center, according to Maryland State Police. Two children, ages 9 and one month, are being treated at Johns Hopkins Hospital. According to Johns Hopkins on Saturday afternoon, the 9-year-old is in good condition, but the baby is in critical condition.

The driver of a truck, Eric D. Hause, 50, of Severn, was taken Harbor Hospital and released, police said.

Three children in a third car, ages 10, 8 and 5, were taken to St. Agnes Hospital, police said. Their father, Jakin Rankin, 33, of Lanham told police he was not injured.

The crash took place just after 3 p.m. Friday. According to police, Grooms was driving her Honda Accord southbound when her car veered across the grass median and entered the northbound lanes of the parkway.

The Honda struck Hause’s truck head-on. The truck rolled onto its side and hit Rankin’s Buick, which was also traveling north. Commercial vehicles are not allowed on the parkway.

According to the Maryland State Police’s investigation, both Grooms and her son were wearing seatbelts, while the baby was in a child safety seat. Police have not yet been able to determine why Grooms’s car veered off course.

All lanes were reopened to traffic at 7 p.m. Friday, and the investigation is ongoing.