Detective Conners (Jason Statham) apparently kills a car hijacker called John Curtis and the young woman the hijacker is using as a shield. Newspapers and reporters blame Detective Conners and his partner York. After a fellow police officer, Callo, testifies against them, Conners is suspended, and York is fired. York tried to kill John, but York accidentally killed the hostage. John tried to kill York, but Conners killed John in self-defense.In the present day, Lorenz (Wesley Snipes) and four other criminals take hostages in a bank. Lorenz has only one demand, to negotiate with Conners. Conners is reinstated but put under the surveillance of a new partner, the young Inspector Dekker. Conners is given control of the negotiations, and after a bank teller is shot, he orders a SWAT unit to cut the building's power and go in. During an explosion, the criminals flee during the ensuing panic and chaos.Dekker and Conners learn more about each other at a local diner, slowly building a friendship, but Dekker disapproves of Conners' cowboy methods. Dekker explains that during negotiations, Lorenz was making many cryptic references to chaos theory. As they leave to examine new evidence, Conners pays with ten dollars and says he does not like to tip. Dekker swaps the ten for a twenty of his own.A TV camera caught a shot of one of the criminals, who is arrested together with his girlfriend at her home, where banknotes are found with a scent used to mark evidence collected by the police. The banknote serial numbers did not come from that day's robbery, but had been placed in police storage and signed out a fortnight earlier by Inspector Callo. He is found shot dead in his home, in possession of other incriminating evidence.They review CCTV footage of the bank, and Dekker notices one corner of the bank is deliberately shielded from view. In that corner, they find the bank presidents computer. Fingerprints on the keyboard reveal the identity of a hacker that Conners himself had arrested, but whose conviction was overturned after the shooting on the bridge. Conners and Dekker question the hacker, but he is shot dead by Lorenz, and a gun fight ensues; Lorenz escapes.Dekker asks to question the bank robber identified in the news TV footage and finally breaks him when he casually explains the impact of a massive overdose of morphine while slowly injecting some into the saline drip of the suspect. An amazed Conners watches and later calls him a hypocrite. Dekker responds by explaining he only injected more saline solution.The suspect reveals Lorenz is Scott Curtis the brother of John shot earlier, and Conners leads a stakeout at an address where all the gang are to meet that night. It is Scott's house. Forced to go before Scott arrives, a shootout results in both suspects' deaths, and a bomb blows up the building while Conners is inside.Dekker is devastated but realises that Callo's signature requesting material from the evidence storage was forged by the evidence custody officer, who reveals that Scott is actually York. In flashback, York stands on the bridge and fires the first shot, killing the woman hostage in the opening sequence. Tracking Lorenz/York's mobile phone, Dekker surprises York at a diner, and York takes a hot woman hostage in a reversal of the stand off on the bridge. York is pissed because he got fired. Dekker and York fight and York is killed.When Dekker pays for his coffee at the diner, he discovers the banknote Conners used to pay for lunch with is also scented, which means Conners was also involved in taking the money from police evidence. Dekker finds a copy of James Gleick's book on chaos theory, showing he had faked an earlier ignorance of the mathematics. On a hunch, Dekker looks for airplane tickets booked in the name of James Gleick and runs to the airport.During a mobile call between the now disguised Conners and the searching Dekker at the busy airport, flashbacks reveal how the seemingly unconnected events in the film form a pattern, just as predicted in chaos theory. Conners reveals that he placed his badge on Scott's corpse before the explosion. Conners &amp; York recruited a group of ex-convicts from their past. Callo was framed for being a dirty cop. Conners ends the call, walks casually to a private jet, and takes off while sipping champagne.
Output: Question: Whose gang pull a bank robbery?, Answer: Lorenz's gang