Israel's assassination of Hezbollah leader Hassan Nasrallah last week reportedly sparked paranoia among senior Iranian officials and the country's Supreme Leader Ali Khamenei, according to Reuters.

Israel targeted a major airstrike on Nasrallah's bunker on Friday, the latest blow to Hezbollah, which has been attacking Israel since last year and is weakening. According to senior Iranian officials, Khamenei reportedly warned Nasrallah days before the assassination that Israel was trying to kill him and urged him to flee Lebanon. said The person spoke to Reuters on condition of anonymity. (Related: Israel warned Iran it would attack its nuclear facilities if attacked, officials say)

According to the report, Iran has long feared that the Israeli intelligence agency Mossad is infiltrating Tehran. Those concerns grew even more after Nasrallah's death, with Iranian officials becoming concerned about Khamenei's safety, officials and sources told Reuters.

“The trust that held everything together is gone,” an Iranian official told Reuters.

“[Khamenei] We don’t trust anyone anymore,” another official close to the Iranian regime told Reuters.

Another Iranian official told Reuters that authorities have launched an investigation into whether some Iranian officials and members of the Iranian military were compromised. The investigation is particularly focused on officials who travel abroad or have family members.

One of the officials told Reuters that authorities were suspicious of Iranian military personnel who had recently been in Lebanon. A military official had recently asked questions about Nasrallah's whereabouts, raising eyebrows among other officials. The person was arrested along with several others, officials told Reuters.

Khamenei's warning to Nasrallah was made through an Iranian military emissary who was in Nasrallah at the time of his death, following widespread Israeli targeted attacks against Hezbollah, officials told Reuters. In late September, thousands of pagers and walkie-talkies by Hezbollah operatives were randomly detonated, but although the country has not claimed responsibility, it is believed to have been a remote detonation orchestrated by Israel.

However, Mr. Nasrallah, who often operated from underground bunkers in Lebanon, said at the time that he felt safe and that security officials He trusted him to protect him, officials told Reuters. Khamenei once again proposed to Nasrallah through military emissaries that he move to Iran, but Nasrallah indicated that he wanted to remain in Lebanon.

Following Nasrallah's assassination and the recent devastating blow to Hezbollah, the security situation with the terrorist organization is now such that it is difficult to even hold a public funeral for Nasrallah, four sources familiar with the matter told Reuters. The situation is so severe that it is impossible to do so.

“No one can allow a funeral under these circumstances,” one Hezbollah official lamented to Reuters.

Israel is expected to retaliate against Iran following a wide-ranging missile attack launched by Tehran on Tuesday, which was largely foiled by interceptions by Israeli and American forces. It is not clear when or what the retaliatory strike will be, but Israel has promised there will be “consequences” for Iran.

Israeli Prime Minister Benjamin Netanyahu told the Security Cabinet: “Iran has made a big mistake and will definitely pay the price.” meeting on tuesday.

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