The FBI are searching for a man who displayed some suspicious activity at a grocery store on Michigan's east side this weekend.

The man was seen sprinkling liquid on food carts just after 9 a.m. on Sunday, April 24, at a Washtenaw County grocery store, according to a news release from the FBI.

Tests were run on the liquid, and they came back negative for harmful substances. But, authorities would still like to speak with the man.

Authorities have not released the name or location of the grocery store.

Anyone with information is asked to call the FBI at 855-324-7257.