Question: Who is killed when the dam bursts ? If there is no answer, please output "Insufficient information to provide an answer.". Movie title: X2 Context: At the White House, brainwashed teleporting mutant Nightcrawler attempts to assassinate the President of the United States but fails and escapes. Meanwhile, Wolverine returns to Professor Xavier's school for mutants, while fellow X-Men Storm and Jean Grey find Nightcrawler with the help of the mutant-tracking machine Cerebro. Xavier and Cyclops visit Magneto in his plastic prison cell, inquiring about the assassination attempt, and Xavier discovers that military scientist Colonel William Stryker has been extracting information about Cerebro from a brainwashed Magneto using an injectable drug. Stryker and his assistant Yuriko Oyama capture Cyclops and Xavier and raid Xavier's school. Wolverine kills many of Stryker's men, while Colossus helps most of the students escape through hidden tunnels. Rogue, Iceman, Pyro, and Wolverine attempt to escape until Wolverine is confronted by Stryker, who fails to shed light on Wolverine's past. Iceman helps Wolverine escape, but Stryker's soldiers succeed in sedating six students and breaking into Cerebro. During a confrontation with the mutant-hating Stryker, Xavier learns Stryker is behind the plot to assassinate the president. Impersonating Senator Robert Kelly and Yuriko, the shape-shifting Mystique gains information about Magneto's prison and helps him escape while also discovering schematics for another Cerebro. Wolverine, Rogue, Iceman, and Pyro visit Iceman's parents in Boston. Responding to a 9-1-1 call from Bobby's brother Ronny, the police arrive just as the group is leaving. Pyro uses his fire-projection power to fend off the police but when he starts attacking the incoming police cars, Rogue stops him by briefly draining his life force. The X-Jet arrives to pick the group up and is targeted by two Air Force F-16 fighter jets. They are hit by a missile, but Magneto saves their jet from crashing. Magneto informs them that Stryker orchestrated the attack on the president to provide rationale to raid Xavier's school in order to steal Cerebro's parts, and plans to...
Stryker is killed when the dam bursts.