Iran’s armed forces have confirmed the death of top Islamic Revolutionary Guard Corps commander Ali Shadmani following an Israeli air strike last week, AFP reports.

The military’s Khatam al-Anbiya Central Headquarters, which Shadmani led, vowed “severe revenge” for what it called the “criminal act” by Israeli forces, announcing the commander had died from injuries sustained in the attack, according to the IRNA state news agency.

The confirmation of his death came a day after a US-announced ceasefire ended 12 days of open conflict between Israel and Iran.

Shadmani died just days after he took over the role from Gholam Ali Rashid, who was killed in the first days of Israel’s attacks.