FBI agents executed a search warrant Wednesday at Dane Fine Art, a wholesale art gallery at 2320 Haverford Road in Ardmore that claims an inventory of more than 52,000 works, including pieces by Picasso, Warhol and Dalí.

The gallery was closed to the public during the search. Brown paper covered the windows and doors, and federal vehicles filled the parking lot, according to Philadelphia Magazine, whose reporter Victor Fiorillo witnessed agents going in and out of the two-story building and handling artwork through the showroom door.

No charges have been announced.

FBI Philadelphia spokesperson Sofia Kettler confirmed the activity but provided no details about the nature of the investigation. Neither the gallery nor its owners responded to requests for comment from multiple news outlets, including 6abc and CBS News Philadelphia.

An employee who answered a phone number posted on the gallery's front door told Philadelphia Magazine: "The owners texted me this morning and said we were closed, but I'm not quite sure why."

Dane Fine Art describes itself on its website as "the finest wholesale fine art and print dealer in the world for over 45 years," with a staff of more than 25 art professionals and over 13,000 square feet of gallery and warehouse space. The gallery also operates as an auction house, hosting weekly auctions. It sits between a nail salon and the bar McSorley's on Haverford Road.

Philadelphia Magazine reported that a 2013 incorporation document filed with the Pennsylvania Department of State for Dane Fine Art LLC lists a Villanova address associated with Leslie Isen, wife of Nathan "Nicky" Isen. The website for Isen's longtime Philadelphia gallery, I.

Brewster & Company, redirects visitors to DaneFineArt.com and lists the same 2320 Haverford Road address. Isen pleaded guilty to money laundering in 2015 after selling 12 pieces of artwork for $20,000 in cash to an undercover federal agent and coaching her on how to launder drug money through art, according to the U.S. Department of Justice. He was sentenced to three years' probation and fined. His current role at Dane Fine Art, if any, has not been confirmed by the gallery or law enforcement.