BEIRUT — Hamas leader Ismail Haniyeh was assassinated in Iran after attending the inauguration of the country’s new president, Iran and the militant group said early Wednesday. Hamas blamed an Israeli airstrike for the death of the head of the Palestinian militant group’s political bureau. Iran’s paramilitary Revolutionary Guard said it was investigating the attack and did not say how it occurred. [time-brightcove not-tgx=”true”] Israel has vowed to kill Haniyeh and other leaders of Hamas over the group’s Oct.