The film is based on Hussain Zaidi's book Black Friday: The True Story of the Bombay Bomb Blasts. Aparna Chaturvedi, Dr. Tushar Patel and Devashish Makhija did the additional research. 
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Black Friday at 15: Interesting facts about the film

Anurag Kashyap's Black Friday has completed fifteen years. The film, chronicling the 1993 Bombay blasts and its aftermath, has a cult status. It was premiered at the Locarno International Film Festival in 2004. Its Indian release was stalled due to the pending trial of the bombings. It was eventually released in theatres in 2007.  

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