Additional funnels were reported east of Des Moines past Altoona, Prairie City and Colfax and funnel clouds were reported further north near Iowa Falls.
Since the severe weather outbreak began Wednesday, there have also been two reported tornadoes in South Dakota and a reported tornado in Minnesota.
Lt Shane Cox from Pella Police Department in Iowa told United States news a number of people have been injured and taken to local hospitals.
On Friday Alliant Energy was working to restore electricity to almost 6,400 customers in the Marshalltown area, which appeared to have been hit the hardest Thursday afternoon.
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'This morning, it didn't look like tornadic supercells were possible, ' Krull said. A several people were taken to the hospital for what are described as minor injuries. News organizations in the area reported damage to houses and cars in and around Bondurant.
'If anything, we were expecting we could get some large hail, if strong storms developed'.
The hardest hit areas were the central Iowa cities of Pella, Marshalltown and Bondurant. The National Weather Service received 31 tornado reports in Iowa.
A flag sticks out of a pile of bricks from a damaged building along the square Thursday, July 19, 2018, after a tornado ripped through Marshalltown, Iowa.
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Clothing store owner Stephanie Moz and her husband were eating lunch with their 2-month-old baby when the twister approached, so they took shelter in the basement of the business, she told the Associated Press.
"There are houses with windows out, houses without roofs, " he said.
A statement from Vermeer Corporation in Pella says, "There has been major damage to multiple facilities".
The exact number of tornadoes and their strength will be determined later. According to Vermeer CEO Jason Andringa, about 400 dealers and customers were on the site as part of a 70th anniversary event when the storms struck. The National Weather Service relayed reports of "catastrophic damage", with overturned vehicles and tops of buildings "gone".
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