FBI agents arrive and take command of the police situation outside, ordering the building's power be shut off. The loss of powerâas Gruber had anticipatedâdisables the vault's final lock. Gruber demands that a helicopter arrive on the roof for transport, and the FBI prepare to double-cross him by sending helicopter gunships to take down the terrorists. However, McClane discovers that Gruber's true intention is to detonate the explosives on the roof, to fake the deaths of his men and himself so they can escape with the bearer bonds, a plan that would also kill the hostages. Meanwhile, Gruber sees a news report by intrusive reporter Richard Thornburg that features McClane's children, and deduces that McClane is Holly's husband. The criminals order the hostages to the roof, but Gruber takes Holly with him to use against McClane. McClane defeats Karl in a fight, kills Uli, and sends the hostages back downstairs before the explosives detonate, destroying the roof and the FBI