Hamas said Haniyeh was killed "in a Zionist airstrike on his residence in Tehran after he participated in the inauguration of Iran's new president."
Hamas leader Ismail Haniyeh was assassinated in Tehran, Iran's paramilitary Revolutionary Guard said early Wednesday, and Hamas blamed Israel for the attack.
Hamas officials did not immediately respond to requests for further comment.
In April, an Israeli airstrike in Gaza killed three of Haniyeh's sons and four of his grandchildren.
Haniyeh was in Tehran to attend Iran's President Masoud Pezeshkian's swearing-in ceremony on Tuesday, along with other Hamas officials and officials from Hezbollah and allied groups.
Persons:
Ismail Ismail Haniyeh, Haniyeh, Ismail Haniyeh, Israel, Sinwar, Masoud Pezeshkian's, Fouad Shukur, Shukur, Biden, Bill Burns, Brett McGurk, Mohsen Fakhrizadeh
Organizations:
Revolutionary Guard, Al, Israel, Guard, CIA, White, Hamas, Gaza Health Ministry
Locations:
Tehran, Israeli, Israel, Palestine, Gaza, Qatar, Al Jazeera, Iran, Beirut, Lebanese, U.S, Rome, East, North Africa