St. Louis police were investigating an incident in which a woman waving a gun inside a vehicle and saying she was “ready for Ferguson” apparently shot herself in the head by accident, CNN reported Sunday.

The St. Louis Metropolitan Police Department said the shooting occurred Friday night in the city’s downtown area. Sources briefed on the investigation told CNN that a police report identified the victim as 26-year-old Becca Campbell.

The sources told CNN that the victim was involved in a car accident. Campbell’s 33-year-old boyfriend, who was not identified, was driving the car and told investigators that Campbell began waving a gun around and joking that the couple were ready for Ferguson, the sources said.

The boyfriend said he rear-ended another car while ducking to avoid the gun, which then discharged and struck Campbell in the head, the sources said. The victim later died at a hospital.

The boyfriend told police that the couple purchased the gun because they feared unrest that may arise from a grand jury decision in the fatal shooting of unarmed black teen Michael Brown by a white police officer, the sources said.

Police were investigating whether the boyfriend’s account of the shooting was correct, the sources told CNN.