context: The story starts in the city of Mumbai where a motorbike gang starts breaking into banks and other public places and vanishing on Western Express Highway.
  Assistant Commissioner of Police Jai Dixit (Abhishek Bachchan) a no-nonsense cop, is called inside the case. Dixit seeks the help of a thief named Ali Khan (Uday Chopra), and devises a trap to catch the gang, but it fails. Kabir (John Abraham), the leader of the gang, eventually taunts Dixit by saying that he couldn't catch him even if he was right in front of him. He is proven correct and the failure of Dixit seemingly leads to the break-up of his partnership with Ali.
  Kabir then lures Ali into his gang to take place of Rohit, the gang member who was killed by ACP Dixit. Ali falls in love with Sheena (Esha Deol), another gang member. The gang later goes to Goa to perform one last big heist before becoming disbanded forever. Kabir now sets his eyes on the biggest casino in all of India. Kabir and his gang swiftly loot the casino on New Year's Eve, but soon they realize that Dixit has led them right into a trap. Ali was working for Dixit the whole time and a fight ensues.
  Kabir manages to escape from ACP Dixit, and goes back to the gang's truck where Khan has tied up Sheena. Kabir then viciously beats up Khan for his betrayal, but Khan is saved by the timely arrival of Dixit at the scene. The gang flees, except for Sheena; while Dixit and Khan give chase. All the other gang members except Kabir are killed by Dixit and Khan. Kabir tries to escape on his bike. He is then cornered by Dixit and Khan with nowhere to go. So Kabir decides to commit suicide rather than let Dixit arrest him, and rides his bike over the edge of a cliff and into the water. The movie ends with Dixit and Khan arguing with each other.
question: Who heads the gang?
answer: Kabir