Nineteen works of art, including a silkscreen by artist Andy Warhol, were stolen from a private collection in Detroit, Fox 2 reported Monday.

According to the Detroit News, the original silkscreen by Warhol for his "Flowers" print was one of the 19 pieces taken between April 27 and 29 from storage in the Corktown neighborhood. The collector's identity is being kept under wraps.

Combined, the artworks are worth millions. The FBI believes the thieves knew the value of the art and likely already have taken the pieces across state lines, and potentially out of the country, according to Fox 2.

Art is sold on its own black market, but some thieves have more personal (and perhaps crazier) motives, like Mark Lugo, who was recently caught taking expensive pieces to spruce up his own home.

Take a close look at some of the missing pieces in the photo gallery below. If you see any of them adorning the walls of a friend's home, make sure to alert the FBI at (313) 965-2323. There is a $5,000 reward being offered, according to the Associated Press.

It's not likely that the pieces will turn up, unfortunately -- less than 15 percent of stolen artwork is ever recovered.

See Fox 2 for the full report, and if you can't get enough of suspenseful art heists, check out some of the greatest thefts of all time.

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  • Silkscreen for "Flowers" Print

    Silkscreen for "Flowers" print by Andy Warhol, mid-1960s. Photo on silkscreen.

  • "Portrait of Arnold Weinstein"

    "Portrait of Arnold Weinstein" by Andres Serrano, 2003. Photograph.

  • Dymaxion Map

    Buckminster Fuller's Dymaxion map map of the world modified with roofing tar in triangular shapes, by Matthew Day Jackson, 2009-2010. Paper map with roofing tar.

  • "Janet or No Name Portrait"

    "Janet or No Name Portrait" by Larry Rivers, circa 1967. Graphite on paper.

  • "Study for O'Hara Painting"

    "Study for O'Hara Painting" by Larry Rivers, 1954. Graphite on paper.

  • Untitled

    Portrait believed to be a self-portrait of Rene Ricard, 1970. Pencil on paper.

  • "West"

    "West" by Francisco Clemente, 1990s. Etching and aquatint on paper.

  • Untitled

    "Untitled" by Terry Winters, 2009-2010. Etching and drypoint on paper.

  • Also On HuffPost: Investigators Find Stolen Picasso in Suspect's Apartment

    Mark Lugo was arrested July 6th after getting caught with a Picasso sketch worth $200,000. Police uncovered a mini stolen art gallery in his house.