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Criminal investigation underway at Chipotle

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Chipotle says it has been served with a federal grand jury subpoena as part of a criminal investigation tied to a norovirus outbreak this summer at one of its restaurants in California.

**See previous coverage of this story above**

The investigation is being conducted by the U.S. Attorney’s Office for the Central District of California in conjunction with the Food and Drug Administration, the company said in a filing with the Securities and Exchange Commission Wednesday.

Chipotle Mexican Grill says the subpoena requires it to produce a “broad range” of documents.

The Denver company has been reeling since an E. coli outbreak linked to its restaurants, which was followed up by a separate norovirus outbreak in Boston. Chipotle says it expects sales for the fourth quarter to be down 14.6 percent.

Continuing coverage here.