Pittsburgh area Sheetz convenience stores have been linked to an outbreak of salmonella that has made 34 people ill in 11 counties. State Department officials told KDKA that they believe produce brought in to Sheetz convenience stores from an outside supplier may have been contaminated with salmonella.

Sheetz is working with the Health Department to discover the source of the contamination. Health officials told KDKA that they believe produce brought into the stores — most likely a cold, over-the-counter deli product like lettuce or tomatoes — is to blame.

Sheetz has set up a toll-free hotline for customers; for more information call 1-800-765-4686.