DARIEN - Darien police are investigating after a 7-year-old girl found a rusty nail inside a chocolate chip cookie.

Investigators say the cookie was purchased from the Panera Bread on the Post Road last week.

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They say it did not appear to have been placed in the cookie intentionally. A representative for Panera told News 12 Connecticut that the cookie dough is supplied by a third-party vender that has procedures in place to detect metal. Both parties are looking into the issue.

Police say the girl wasn't hurt after she bit into the cookie.