(MADISON, Ind.) -- A teenager who authorities say was driving the car that ran over several people at an Ohio River speedboat race was taken to a hospital after apparently suffering a seizure at his home.Paramedics early Tuesday took Michael Bowen, 18, from his home outside Madison to King's Daughters' Hospital. He was treated and released, hospital spokeswoman Nadja Boone said. Witnesses at the boat race said Bowen appeared to be slumped over the steering wheel as his speeding car left a street and hurtled into the riverfront area crowded with people attending the Madison Regatta on July 2. Eight bystanders were hurt, with two still listed in serious condition on Wednesday in the intensive care unit at University Hospital in Louisville, Ky. Investigators have been awaiting results of blood tests to determine whether Bowen was under the influence of drugs or alcohol before deciding whether to seek criminal charges against him. A message seeking comment on the case was left Wednesday for Jefferson County Prosecutor Chris Naylor. Jefferson County Sheriff Bill Andrews said the seizure call was considered a medical matter and that police would not investigate it. One hurt bystander still hospitalized was Jennifer Willette, 28, of Madison Heights, Mich., who has had amputations, her father said. Priscilla Johnson, 56, of Madison, suffered compound fractures of her right leg, a shoulder shattered in five places and had her spleen removed, said her husband, David. "I'm praying we can get her through this and get her home," he said. Copyright 2006 Associated Press. All rights reserved. This material may not be published, broadcast, rewritten, or redistributed.