UPDATE: Hospital officials say a 2-year-old has become the fourth person to die after a woman suspected of driving under the influence plowed into an Oklahoma State University homecoming parade crowd.
The child's death was reported Saturday evening in a news release from OU Medical Center and The Children's Hospital in Oklahoma City. The child died at The Children's Hospital.
Police have said a car driven by 25-year-old Adacia Chambers struck an unoccupied motorcycle of an officer working security at the parade Saturday in Stillwater. The vehicle then went into the crowd.
In addition to the four deaths, more than 30 were injured. They included eight who were airlifted to hospitals with critical injuries.
Chambers was taken into custody on the DUI charge.

At least three people were killed and 22 others were injured when a driver plowed into a crowd at Oklahoma State University's homecoming parade Saturday morning, officials said.   

The 25-year-old driver of the car, Adacia Chambers, was driving under the influence, Stillwater police said at an afternoon news conference. Multiple people on the scene were being treated by fire and emergency personnel along the street.

Of the 22 injured in the crash, at least eight were critically hurt and seven seriously, police said.

A Stillwater Hospital spokeswoman told NBC News that at least 20 patients had been brought in with injuries ranging from minor to serious. More patients were being flown to Oklahoma City and Tulsa, she said. Oklahoma City is about 70 miles south of Stillwater and Tulsa is about 70 miles east.

Oklahoma State didn't immediately elaborate on the cause of the injuries but said in a post on Twitter: "Oklahoma State University is saddened by the tragic parade incident earlier this morning. Our thoughts & prayers are with those affected."

OSU's "Homecoming Sea of Orange Parade" was set to start at 9 a.m. (10 a.m. ET) Saturday and last until 11 a.m. before the school's 2:30 p.m. game against the University of Kansas.