A tornado tearing through South Dakota’s largest city on Tuesday night knocked down power lines and caused some significant structural damage, according to a report.

There were no early indications of injuries or fatalities from the twister that struck the south side of Sioux Falls around 11:40 p.m., the Argus Leader reported.

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Nearly 13,000 utility customers were left without electricity, Xcel Energy reported, according to the newspaper.

A flash flood warning remained in effect for the area while the tornado moved on to Minnesota and Iowa, the report said.

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The newspaper reported via Twitter that Avera Heart Hospital lost parts of its roof and some patients “need attention.”

A Best Buy store and other businesses also suffered roof damage, social media posts said.

This is a developing story. Check back for updates.