Dozens of buildings were damaged and nine people were hurt when three tornadoes struck South Dakota’s largest city, according to the National Weather Service.

Fire Chief Brad Goodroad said at least 37 structures collapsed in Sioux Falls or have structural problems after the storm rolled through the city just before midnight Tuesday. There were no reports of deaths.

The tornadoes were rated EF-2 with estimated peak winds of 130 mph, said Todd Heitkamp, weather service meteorologist.

Mayor Paul TenHaken said the city was looking into a “breach of protocol” after outdoor sirens didn’t sound across the entire city. TenHaken said most sirens sounded in the hardest hit areas of Sioux Falls, the southwest part of the city. However, they were supposed to sound citywide.

Among the buildings damaged was Avera Behavioral Health, where the storm ripped off part of the roof and significantly damaged windows.

Several patients were moved to another location. One patient suffered an injury, which was not life-threatening, said Avera spokeswoman Michelle Pellman.

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Other damaged businesses included an Advance Auto Parts store, where a wall collapsed. A Kohl’s and a Best Buy lost part of their roofs and a Pizza Ranch suffered heavy damage.

Xcel Energy said as many as 25,000 customers were without power at one point.

The Red Cross opened a shelter at the Sioux Empire Fairgrounds’ armory.

Sioux Falls, with an estimated population of 187,200, is about 180 miles north of Omaha.

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