ANN ARBOR, MI -- The FBI is looking to speak with the man suspected of attempting to contaminate food products inside the Whole Foods Market on Eisenhower Parkway in Ann Arbor.

FBI Spokesperson Jill Washburn did not divulge the identity of the store at which the man was seen sprinkling an unknown liquid substance on food carts last week, but believes photos released will help in leading to the man's identity.

"We do not know what the substance was," she said. "The only thing that he was seen sprinkling the substance on was food."

Whole Foods Market Public Relations representative Allison Phelps confirmed a team member from the Eisenhower Parkway store witnessed the man pouring liquid on items at the food bars and alerted store leadership of the suspicious activity.

"Out of an abundance of caution, all salad and hot food bars were immediately closed down at the store, all food was thrown out and the store team thoroughly cleaned and sanitized all food stations, equipment and serving utensils before restocking with fresh items," Phelps said in an email.

Phelps said Whole Foods Market is cooperating fully with the Ann Arbor Police Department regarding the incident and all surrounding Michigan store locations have been notified of the incident.

Preliminary tests have not shown the substance to be harmful, but Washburn would not say "unequivocally" that it has been determined to not be harmful.

Washburn said the FBI would need to speak with the man first before determining if he would face any charges related to the incident.

"I think we need to speak with him first," she said. "The photos are relatively clear, so someone should be able to notice who it is."

One of the photos appears to indicate the man was seen walking into the store around 9:13 a.m. on April 24.

If you have any information about the man's identity, contact the FBI at 855-324-7257.