The FBI is looking for 19 contemporary artworks worth millions, including a "Flowers" silkscreen by Andy Warhol, stolen last month from a collector in Detroit.
The pieces were being stored temporarily at the collector’s business in the city’s historic Corktown neighborhood when they were stolen. Authorities didn't name the owner or the business.
An FBI spokesman said the works weren't on display -- or locked up -- and the thieves have likely taken the pieces across state lines, or the U.S. border, to try to sell them.
"So we're putting out the message to anyone in the art community, anyone who's shopping online and looking at art, anyone who's involved in the pawn shop business, that these could all be avenues that someone who's stolen this art could pursue in order to try to make a profit," the spokesman said.