UPDATE | 4 dead, including 2-yeaer-old, after Okla. State homecoming parade

STILLWATER, Okla. (AP) — A woman suspected of driving under the influence plowed into a crowd today during the Oklahoma State University homecoming parade, killing four people — including a toddler — and injuring dozens more in a collision that sent some spectators flying through the air.

Stillwater police Capt. Kyle Gibbs said the woman's Hyundai Elantra struck an unoccupied motorcycle of an officer who was working security at the parade, then went into the crowd. She was taken into custody, and Gibbs said investigators were awaiting the results of blood tests to determine if she was impaired by drugs or alcohol.

Oklahoma University Medical Center and The Children's Hospital announced in a statement tonight that a 2-year-old was the fourth person to die from injuries suffered in the morning crash. Five children and three adults remained hospitalized with conditions ranging from good to critical, officials said. Gibbs had said earlier that 34 people were taken to the hospital.

Police said Adacia Chambers, 25, of Stillwater, was arrested on the DUI charge.

"We treat these like we would any homicide investigation," Gibbs said. "It'll probably take several days to get additional information as to the cause of the accident."

Chambers' father, Floyd Chambers of Oologah, told The Oklahoman newspaper he couldn't believe his daughter was involved and said she was not an alcoholic. He described his daughter as "timid" and said she had attended homecoming festivities Friday night with family but that her boyfriend had told him she was home by 10 p.m.