The shah traveled to several countries before entering the United States in October 1979 for medical treatment of his cancer. In Tehran, Islamic militants responded on November 4 by storming the U.S. embassy and taking the staff hostage. With the approval of Khomeini, the militants demanded the return of the shah to Iran to stand trial for his crimes. The United States refused to negotiate, and 52 American hostages were held for 444 days. Mohammad Reza Shah Pahlavi died in Egypt in July 1980.