From the Daily Caller News Foundation

By JAKE SMITH

The bomb that killed top Hamas leader Ismail Haniyeh was planted in his guesthouse in Iran two months in advance, according to several reports.

Haniyeh was assassinated after attending the inauguration of the new Iranian president in Tehran, Iran, on Tuesday. Initially thought to be an airstrike, Haniyeh was actually killed in an explosion set off by a bomb that had been planted by assassins two months earlier in a Tehran guesthouse where he had been residing, according to five Middle Eastern officials who spoke to The New York Times.

The bomb was detonated remotely once Haniyeh reached his room in the guesthouse, according to the Times. Two sources with direct knowledge of the matter told Axios that Mossad, Israel’s top intelligence agency, planted and detonated the bomb.

Israel has not taken credit for Haniyeh’s assassination, nor has the U.S. publicly identified who it believes was behind the operation. Israel has taken responsibility for some of its military actions in the past — such as the strike against a high-level Hezbollah operative in Lebanon on Monday — but Mossad’s operations have often been shrouded in mystery and met with silence from the Israeli government.

It is unclear how the assassins were able to plant the bomb to begin with, according to the Times. The Islamic Revolutionary Guards Corps (IRGC), Iran’s military, was tasked with running and providing security for the guesthouse, which is located in an upper-class neighborhood of Tehran.

The assassins managed to bypass IRGC security and plant the bomb in a hidden location, according to the Times. That IRGC officials failed to catch the assassin or detect the bomb in the months that it was hidden represents a massive security and intelligence failure, as well as a stain on the IRGC’s reputation, two Iranian officials told the Times.

When the bomb exploded around 2 a.m. local time, the guesthouse shook and partially collapsed, according to the Times. Officials and medical personnel scrambled to Haniyeh’s room to find that he had died immediately, as did his bodyguard, who was also in the room at the time.

Haniyeh’s death is a major blow to Hamas, given his high-level status as the terrorist organization’s political leader. Iran and Hamas declared Israel was responsible immediately following the news of Haniyeh’s death and have vowed revenge; Iranian Supreme Leader Ali Khamenei reportedly gave the order to strike directly inside of Israel out of retaliation, although the scale or timing of such a strike is unknown, according to the Times.