Lieutenant General Gadi Eisenkot, Chief of Staff of the Israeli Army, said on Tuesday Israeli intelligence believes Hezbollah’s former military leader was murdered by his own men.

Mustafa Badreddine was killed last year in an explosion, originally attributed by Hezbollah as an Israeli airstrike, and then an assassination from a rival Sunni militant group.

A recent report issued by Arab news network al-Arabiya claimed for the first time that Badreddine was instead killed by a subordinate commander within Hezbollah named Hassan Nasrallah. The report, which the Israeli government is now corroborating with their own intelligence sources, claimed that Hassan had Badreddine killed under orders from Qassem Soleimani, commander of Iran’s infamous Quds Force.

Badreddine had been leading the Hezbollah contingent in operations within Syria’s Civil War. Hezbollah has had hundreds of its fighters killed fighting on behalf of the Assad regime.