CHICAGO (CBS) — An off-duty Chicago police officer was stabbed in the head Friday morning during a domestic dispute in the South Shore neighborhood.

The 47-year-old woman was involved in a “domestic incident” at about 8:15 a.m. near 76th and Stony Island, police said. Fire Department officials said she suffered multiple stab wounds, including to the head.

Witnesses said the officer was in the driver’s seat of a Ford Expedition when she was attacked. The SUV crashed into the back of a school bus.

LeTonya Robinson saw a man standing next to the window of the SUV begin stabbing the officer.

“They were getting into it. You could tell it was some type of confrontation, or whatever. So I just saw blood. The guy just took off and ran through the alley, and I saw blood. It’s a lot of blood on the street,” she said.

The man who stabbed the officer was spotted running south on Cornell Street.

The officer was taken to Northwestern Memorial Hospital in serious condition.

A 12-year-old boy who was on the school bus was taken to Jackson Park Hospital with a headache, according to the Fire Department.

No one was in custody Friday morning.