(Bloomberg) — Buffalo Wild Wings Inc. shares tumbled as much as 7.8% after Kansas health officials said they were investigating reports of a gastrointestinal illness that sickened at least 10 customers.

The Johnson County Department of Health and Environment began receiving the reports on Jan. 29, including some from students at the local school district in Overland Park, Kansas, where the restaurant was located. The agency, which is working with the state's health and agriculture departments and the city of Overland Park, said on Wednesday that it was waiting on lab results.

Buffalo Wild Wings closed the restaurant in question and sent in a third-party vendor for a "thorough cleaning," the company said in an e-mailed statement. It reopened on Wednesday after a consultation with the health department.

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