The wind was far stronger than that in other areas of the fairgrounds, said Dan McCarthy, chief meteorologist for the National Weather Service in Indiana. He estimated the gust at 60 to 70 mph.
Gov. Mitch Daniels said precautions were taken before the storm, but no one could have foreseen such a strong gust focused in one place. Some witnesses have said that while a storm was expected, rain hadn't begun to fall when the wind sent the stage rigging falling into the crowd of terrified fans.
"This is the finest event of its kind in America, this is the finest one we've ever had, and this desperately sad, as far as I can tell fluke event doesn't change that,"Daniels said.
Four people were killed when the metal scaffolding that holds lights and other stage equipment fell and a fifth died overnight at a hospital, Indiana State Police 1st Sgt. Dave Bursten said. The county coroner's office identified the victims as Alina Bigjohny, 23, of Fort Wayne; Christina Santiago, 29, of Chicago; Tammy Vandam, 42, of Wanatah; and two Indianapolis residents: 49-year-old Glenn Goodrich and 51-year-old Nathan Byrd. Byrd died overnight.
Forty-five people were taken to hospitals, and some may have gone on their own, Bursten said. Indiana University Health said 12 of the 26 people treated at its hospitals were still there, including three at its children's hospital. It did not provide information about their conditions.
Dr. Dean Silas, who lives in the Chicago suburb of Deerfield, Ill., said in a telephone interview Sunday that some people died immediately. He said he was seated in the grandstand and reached the damage area within five minutes. He saw three bodies already covered with plastic.
Silas said 75 to 100 people at the show immediately began to help. It took 20 to 25 minutes to free those who were trapped, he said. He and others carried some of the injured on makeshift stretchers to a triage area under the grandstand.
He estimated it took 10 minutes for the first ambulances to arrive and for a coordinated emergency medical effort to begin.
Sugarland singer Jennifer Nettles sent a statement to The Associated Press through her manager, saying she watched recaps of the collapse on the news "in horror."
"I am so moved," she said. "Moved by the grief of those families who lost loved ones. Moved by the pain of those who were injured and the fear of their families. Moved by the great heroism as I watched so many brave Indianapolis fans actually run toward the stage to try and help lift and rescue those injured. Moved by the quickness and organization of the emergency workers who set up the triage and tended to the injured."
Nettles and Kristian Bush, who perform as Sugarland, canceled their Sunday show at the Iowa State Fair.
Sugarland manager Jason Owen referred questions about the accident to fair officials, saying in an email, "it was their stage and lighting rigs so it wouldn't be right for us to comment."
Fair director Cindy Hoye said it was too soon to talk about who was responsible for the stage and its rigging because the investigation had just started, but she had confidence in Mid-America, the company that owns the stage. Mid-America did not respond to messages left Sunday.
A timeline released by Indiana State Police showed fair staff contacted the National Weather Service four times between 5:30 p.m. and 8 p.m.
The weather service said at 8 p.m. that a storm with hail and 40 mph winds was expected to hit the fairgrounds at 9:15 p.m., and fair staff began making evacuation plans.