Die Hard
The FBI arrives and orders the building's power to be cut. Gruber informs the FBI that he wants two helicopters and he will escort the hostages to the top of the building. The power outage opens up the final locks on the building's vault, where Gruber scoops up the bonds. The FBI plans to send gunships to kill the criminals, but Gruber had lined the top of the building with explosives and plans to blow it up to cover his escape.