After a failed attempt to make "Allwyn Kalicharan" in 2003, Kashyap started working on "Black Friday", a film based on the by Hussain Zaidi about the 1993 Bombay bombings. The Bombay high court put a stay on the release of the film, until the judgement in the bomb blasts case was delivered. It was decided after a petition filed by a group of 1993 bomb blasts accused, challenging the release of the film based on their case. The film got censorship clearance in 2007, and was released after two years meeting universal acclaim. Nikhat Kazmi gave the film a three star out of five rating and mentioned: "It was indeed a difficult film to make, yet the director has managed to grapple with all the loose threads and put them together in a composite whole. So much so, the film moves like a taut thriller, without ideology colouring the sepia frames."