There are still no answers as to what caused the Sheetz salmonella outbreak. The FDA said it still doesn`t know how the tomatoes were tainted with salmonella.

The FDA said Hurricane Charley wiped out any clues when it hit Florida tomato farms, reports NBC25 News.

Officials think animals probably contaminated the tomatoes. West Virginia-based Coronet Foods supplied the tomatoes to Sheetz and has since gone out of business.

More than 400 people in Pennsylvania, Maryland, West Virginia and Ohio said they got sick from eating the tomatoes.