The Israeli spy agency "Mossad" hired security agents from Iran's Islamic Revolutionary Guard Corps to plant explosives in three rooms of a Tehran compound that killed the head of "Hamas" Ismail Hania.
This was revealed by the Telegraph, citing officials with footage from the building.
The plan was initially for Haniya to be assassinated during his visit to Tehran in May, when he was attending the funeral of the late President Ebrahim Raisi. The operation was canceled "due to the large gathering of people in the building and the high probability that it would fail".
Initially, Iranian state media and "Hamas" claimed that Haniya was killed in a missile attack.
"The New York Times" wrote that the bomb was planted two months ago in the house, which is managed and guarded by the Islamic Revolutionary Guard Corps.
Insiders claim the device was detonated remotely after Hania's presence in his room was confirmed.
Acquaintances say that Hania has previously stayed at the house during his visits to the Iranian capital.
In June last year, Haniya, who was the head of the political bureau of "Hamas" in Qatar, stressed that the attack on his family members would not change the position of "Hamas" regarding ongoing ceasefire negotiations.
However, the fact that the bomb was smuggled into a guest compound guarded by Iran's Islamic Revolutionary Guard Corps indicates a significant security breach.
Israel has neither confirmed nor denied its involvement.