ASHINGTON, Sept. 25 — The president of Egypt and the deputy prime minister of Italy say that Osama bin Laden's network of Islamic terrorists threatened to kill President Bush and other leaders of the industrialized world when they met at a summit meeting in Genoa last July. The White House, in line with longstanding policy not to discuss threats on the president, declined to comment today. In an interview on French television on Monday, President Hosni Mubarak of Egypt spoke in specific terms about the threat, saying that "on June 13 of this year, we learned of a communiqué ...