The U.S. Food and Drug Administration upgraded the classification of recalled broccoli sold at Walmart originally issued in December to its highest recall category, according to the agency’s updated report.

A broccoli product sold at Walmart in Michigan was under recall. Now the FDA says the product may be considered deadly. Here's what to know.

Broccoli florets Walmart stores in 20 states have been under a recall since late last year. The FDA now has updated its recall notice for Marketside Broccoli Florets to Class I, meaning the product could be potentially deadly.