The Pakistani Government yesterday denied involvement in the terror plot and has promised to help in the investigation. However, Asif Ali Zardari, the President, pledged yesterday that he would act swiftly if given any evidence of involvement by Pakistani nationals. "As president of Pakistan, if any evidence comes of any individual or group in any part of my country, I shall take the swiftest of action in the light of evidence and in front of the world," he said.