Extract the answer to the following question from the movie plot. If the question isn't answerable, please output "Can't answer". Question: Who reveals to Bridger that he constitutes the final cell? Title: The Siege Movie plot: Following the bombing of an American military installation in the Middle East (the film shows footage from the 1996 Khobar Towers bombing), the U.S. government orchestrates the capture of the mastermind believed to be behind the attack, Sheikh Ahmed bin Talal. In New York City FBI Special Agent Anthony Hubbard (Washington) and his Lebanese-American partner Frank Haddad (Shalhoub) are told of a hijacked bus, fully loaded with passengers and containing an explosive device. The bomb turns out to be a paint bomb and the terrorists manage to escape. The FBI receives demands to release the sheikh. Hubbard eventually comes into conflict with CIA agent Elise Kraft (Bening). Hubbard takes a terrorist suspect into custody and arrests Kraft. Afterwards another terrorist threat is made and an MTA bus is bombed, though the children on-board are permitted to leave before the bus is destroyed. When the FBI captures a person of interest named Samir Nazhde he admits to signing the visa application of one of the suicide bombers in the course of signing many applications for student visas in his job as a lecturer. However, Kraft insists that Samir is not a terrorist and that his continued freedom is vital to the investigation. The FBI eventually identifies and storms a safehouse belonging to terrorists who are associated with the bombings. However, days later, new terror cells launch more devastating attacks, starting with the bombing of the New Victory Theater in Times Square during an evening performance. This is followed days later by a hostage situation at an elementary school (which is resolved when Hubbard shoots the hostage taker). Shortly after this, a suicide bomber drives a van full of explosives into the lobby of 1 Federal Plaza, the location of the FBI's New York City field office, resulting in over 600 fatalities. In spite of objections, the President of the United States declares martial law and armored vehicles and elements of the U.S. Army's 82nd and 101st Airborne Divisions, under Major General William...
Samir