In a statement released on Saturday, the IRGC said the attack originated from outside the immediate area where Haniyeh was staying.
“This action was designed and implemented by the Zionist regime and supported by the criminal government of America,” the IRGC statement added.
After three days, this marks the first time the IRGC has publicly disclosed the exact cause of Ismail Haniyeh's death, who had traveled to Iran for the inauguration of President Masoud Pezehskian.
During this time, speculations abounded whether a long-range missile was fired from outside Iran's borders, or launched from an aircraft over Iranian airspace.
The IRGC-affiliated Fars News Agency had previously released a photo of the damaged residence, stating that Haniyeh was killed while staying on the fourth floor of a building in Zafaraniyeh in northern Tehran.
Iranian media, including the IRGC-affiliated Tasnim News Agency, previously reported, quoting Khaled Qaddoumi, Hamas' representative in Tehran, that Haniyeh's death was caused by a missile or rocket fired from outside the building toward the room where he was staying.
This contradicts reports by The New York Times and Telegraph, which claimed that the attack was carried out by planting a bomb in Haniyeh's room.