葉偉信
The film was now given the working title "City Without Mercy", and director Wilson Yip was forced to drop plans of shooting in Macau, due to the lack of extras needed for filming. Yip needed 250 extras for one scene, and decided to return to Hong Kong with his crew for filming. Filming in Hong Kong began on 13 November 2006, and the cast for the film had been finalised. Filming finally ended in March, and the film was now given its former title, "Flash Point" (導火線). After filming, it was revealed that the film had gone over budget.