In January the US Senate intelligence committee launched an investigation into whether Bigelow and screenwriter Mark Boal were granted "inappropriate access" to classified CIA material following concern from high-profile members over the film's depiction of torture in the search for the
al-Qaida chief. The probe was dropped in February after
Zero Dark Thirty, which had initially been tipped as an Oscars frontrunner, left the world's most famous film ceremony with just a single award for sound editing.