The Food and Drug Administration has upgraded its classification of a broccoli recall initially reported in late December, labeling it as “Class I” — the agency’s most serious recall

Braga Fresh, based in California, issued a product warning for Marketside Broccoli Florets, the FDA announced last year. It's now labeled deadly.

All potentially affected products are past their expiration date and no longer for sale, but the company is worried consumers may still have some bags in their freezers.

In late December broccoli sold at Walmart was recalled because it was tainted with Salmonella. The U.S. Food and Drug Administration has now upgraded the r