Police say the driver of the gray Porsche accelerated rapidly while leaving the Cars and Coffee event around 11am but lost control and ran into the nearby crowd.
Six victims were transported to an area hospital by ambulance, and five were taken by private vehicle.
Eleven people were taken to local hospitals with injuries after a man driving a Porsche at Saturday morning's Cars and Coffee event at the Boise Spectrum careened into a crowd watching him.
As of now, the driver is cooperating with the police during their investigation and has not been cited, the newspaper reports. Police will forward information to the Ada County Prosecuting Attorney's Office when the investigation is completed.
Boise Police say a driver leaving the auto demonstrate parking garage collided with a few people who were on the walkway.
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The chief said authorities have not ruled anything out in the deaths, including carbon monoxide poisoning from generators. Causes of death have not been released for that person or any of the others who died at the facility.
"The information I have is that the driver was showing off for the crowd", said LeBar.
LeBar said the driver was among several who had turned right off of Entertainment Avenue onto eastbound Overland Road. Attempting a burnout while leaving a vehicle show is nearly never a good idea and only makes the driver look like an idiot while putting other people at risk.
Idaho Statesman news outlet cites Boise Police Lt. Charles LeBar as saying that the driver was "showing off for the crowd" before losing control of the auto.
Lt. Lebar said "excessive acceleration" is to blame for what happened.