Chipotle says the scope of a previously disclosed federal criminal investigation has widened beyond a single restaurant in California.

The company says it has been served with another subpoena requiring more documents related to its company-wide food safety. Previously, it said it was served a subpoena in relation to a California restaurant, where there was a norovirus outbreak over the summer.

Chipotle also confirms its sales at established stores sank 14.6 percent for the fourth quarter after food scares sickened dozens of people around the country.

It's the first sales drop since the company went public a decade ago.

Total revenue fell 7 percent to $997.5 million, while profit fell 44 percent to $67.9 million.

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