Authorities are looking into a report of a threatening graffiti message aimed at Minnesota U.S. Rep. Ilhan Omar.

A photo showing the words “Assassinate Ilhan Omar” was posted to Insta­gram on Feb. 22.

The man who posted the photo wrote that he saw it written on a stall in the men’s room at a Holiday gas station in Rogers.

The post gained more attention after Omar tweeted it on Friday.

A spokesperson with the FBI’s Minneapolis division said Sunday that the bureau was aware of the post and is looking into the matter in partnership with other agencies.