Youssef may have been involved in planning the 1972 Munich massacre , in which 11 Israeli athletes and coaches were killed by the Black September group . This prompted Israel to launch a revenge campaign called Operation Wrath of God , with Youssef as a principal target . In 1973 , Israel sent commandos to Beirut , Lebanon to kill a number of high level PLO officials in the 1973 Israeli raid on Lebanon . Youssef and his wife were killed by gunfire in their bedroom when Israeli commandos stormed into their Beirut apartment
Munich massacre
Munich massacre
Muhammad Youssef al-Najjar