A crew member of Oscar-winning director Kathryn Bigelow's team for the movie "Zero Dark Thirty" applies makeup on an actor during a shoot at the filming location in the northern Indian city of Chandigarh March 17, 2012. [Photo/Agencies]

"Zero Dark Thirty," filmmaker Kathryn Bigelow's action thriller about the hunt for Osama bin Laden, was named best film of 2012 on Wednesday by the National Board of Review - the second accolade for the movie in one week.

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Bigelow was named best director and Jessica Chastain, who plays the starring role of a young CIA officer pursuing bin Laden, was named best actress by the NBR.

Bradley Cooper took home best actor honors for his portrayal of a bipolar, former teacher in the film "Silver Linings Playbook".

" 'Zero Dark Thirty' is a masterful film," NBR President Annie Schulhof said in a statement. "Kathryn Bigelow takes the viewer inside a definitive moment of our time in a visceral and unique way. It is exciting, provocative and deeply emotional."

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Wednesday's awards for the Hollywood treatment of the decade-long operation to hunt and kill bin Laden, based on firsthand accounts, boosts the prospects for the movie to win an Oscar in February. The film, not yet publicly released, also took the top award from the New York Film Critics Circle on Monday.

Leonardo DiCaprio won best supporting actor from the NBR for his role in Quentin Tarantino's new slavery era drama, "Django Unchained," while Ann Dowd took the best supporting actress honors for her role in "Compliance," as a fast-food restaurant manager duped by a prank caller scam.

The NBR, a 100 year-old US-based group of movie industry watchers and film professionals, gave its original screenplay award to Rian Johnson for "Looper," and adapted screenplay to David O. Russell for "Silver linings Playbook".