Nasser Soltani, a senior Guard commander, said "Israel will certainly pay for what it did." He spoke during a ceremony Wednesday for Brig. Gen. Mohammad Ali Allahdadi, who will be buried in his hometown of Sirjan in southeastern Iran on Thursday.
Iran has repeatedly vowed to retaliate against any attacks by Israel or Western powers in recent years. It is unlikely to respond militarily, but may step up the support it already provides to armed groups like the Palestinian Hamas and the Lebanese Hezbollah movements.
Iran and Hezbollah, close allies of Syrian President Bashar Assad, blamed Israel for Sunday's airstrike in the Golan Heights. Israel, which is believed to be behind a number of airstrikes in Syria in recent years, has neither confirmed nor denied involvement.
Allahdadi is one of the highest ranking Iranian officers known to have been killed abroad in decades. Another senior Guard commander, Brig. Gen. Hamid Taqavi, was killed during a battle against the Islamic State extremist group in Samarra, Iraq last month.
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Shiite-majority Iran says it has sent military advisers to assist Syria and Iraq in battling Sunni extremist groups, but Tehran has denied sending combat forces.
Gen. Akbar Fotouhi, another senior Guard commander, accused Israel of being in league with the extremist groups fighting in Syria and Iraq.
"The link between the Zionist regime (Israel) and the Islamic State and extremists became evident in his martyrdom," he was quoted by state TV as saying Wednesday.