The star-studded cast list for the James “Whitey” Bulger-based movie currently filming in the Boston area is growing.

Warner Bros. Pictures confirmed on Wednesday that joining Johnny Depp, who is portraying murderous mob boss Bulger, will be fellow actors Adam Scott, Sienna Miller, Joel Edgerton, Benedict Cumberbatch, Jesse Plemons and Jeremy Strong. A statement from the movie company also said that movie is so far untitled, but is based on the book “Black Mass.”

Follow Michael Naughton on Twitter@metrobosmike.

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