SIOUX FALLS, SD - UPDATE: An early morning press conference reveals no deaths or serious injuries have been reported.
Director of Public Works Mark Cotter reported 37 structures had either collapsed or suffered structural issues.
Mayor Paul TenHaken also stated that not all the city's sirens were activated during the warning.
The city is investigating the cause.
4:41 a.m. - An overnight tornado in Sioux Falls, SD put more than 10,000 people out of power.
An airport six miles from where the tornado hit reported a gust of 62 mph.
The storm damaged several buildings in the Sioux Falls area, including an Advance Auto Parts and buildings on the Avera Heart Hospital campus.
Avera spokesperson Michelle Pellman said one patient suffered a non-life threatening injury.
Resident Julie Mericle said she jumped out of bed from the loud noise surrounding her home.
"It's horrible it truly is...We thought it was just straight lined winds at first but the tree that come down on our house. I'm pretty sure the roof is leaking right now," Mericle said.
The Sioux Falls Police Department has asked residents to stay indoors because of all the downed power outages.
Officials say they won't be able to assess all the damages until daylight.