Inspired in part by Iran’s Islamic Revolution, a young Egyptian army lieutenant emptied his machine gun into President Anwar Sadat in 1981, killing a leader who made peace with Israel and offered the shah a refuge after his overthrow.

The assassination carried out by Khalid al-Islambouli and others from a Sunni Islamic extremist group showed the power of Iran’s Shiite-led revolution to transcend the religious divides of the Muslim world.

Islamists of all stripes initially saw Iran’s revolution as the start of an effort to rid the Middle East of Western imperialism and strongman Arab nationalism. But the sectarian bloodshed that followed the U.S. invasion of Iraq in 2003, Syria’s long civil war and the regional rivalry between Iran and Saudi Arabia have left Sunnis and Shiites bitterly divided.

FILE - In this Oct. 6, 1981 file photo, a gunman, wearing an Egyptian army uniform, fires an automatic Kalashnikov rifle into the reviewing stand during an attack that took the life of President Anwar Sadat and five others in Cairo, Egypt. (AP Photo, File)
FILE – In this Oct. 6, 1981 file photo, a gunman, wearing an Egyptian army uniform, fires an automatic Kalashnikov rifle into the reviewing stand during an attack that took the life of President Anwar Sadat and five others in Cairo, Egypt. (AP Photo, File)
FILE - In this Oct. 6, 1981 file photograph, Egyptian soldiers tend to wounded after an attack on the reviewing platform which killed Egyptian President Anwar Sadat in Cairo, Egypt. (AP Photo, File)
FILE – In this Oct. 6, 1981 file photograph, Egyptian soldiers tend to wounded after an attack on the reviewing platform which killed Egyptian President Anwar Sadat in Cairo, Egypt. (AP Photo, File)
FILE - In this Nov. 30, 1981 file photograph, Khalid al-Islambouli, left, and Abdel Hamid Abdel Aal hold up open Qurans during the second day of their trial in Cairo, Egypt, Monday, Nov. (AP Photo, File)
FILE – In this Nov. 30, 1981 file photograph, Khalid al-Islambouli, left, and Abdel Hamid Abdel Aal hold up open Qurans during the second day of their trial in Cairo, Egypt, Monday, Nov. (AP Photo, File)
FILE - In this Oct. 27, 2015 file photograph, Hezbollah fighters stand atop a truck mounted with mock rockets as supporters chant slogans during a rally to mark the 13th day of the Shiite mourning period of Muharram, in Nabatiyeh, Lebanon. (AP Photo/Mohammed Zaatari, File)
FILE – In this Oct. 27, 2015 file photograph, Hezbollah fighters stand atop a truck mounted with mock rockets as supporters chant slogans during a rally to mark the 13th day of the Shiite mourning period of Muharram, in Nabatiyeh, Lebanon. (AP Photo/Mohammed Zaatari, File)
FILE - In this Nov. 4, 2009 file photograph, waving flags, Iranian school girls attend an annual demonstration in front of the former U. (AP Photo/Vahid Salemi, File)
FILE – In this Nov. 4, 2009 file photograph, waving flags, Iranian school girls attend an annual demonstration in front of the former U. (AP Photo/Vahid Salemi, File)

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