Iran reiterated its pledge on Friday to punish Israel at the funerals of seven military officers killed in an alleged airstrike on the Israeli embassy compound in Syria this week.

State television showed demonstrators holding photos of the victims and banners with slogans such as “Death to Israel” and “Death to America.”

The dead included Brigadier General Mohammad Reza Zahedi, one of Iran’s top soldiers and a senior commander of the Islamic Revolutionary Guard Corps (IRGC), who was visiting the Iranian embassy compound in the Syrian capital Damascus on Monday.

“Any action by the enemy against the Holy Islamic Republic will be met with a response,” Major General Hossein Salami, commander-in-chief of the Islamic Revolutionary Guard Corps, told a crowd gathered in Tehran. “Our brave people will punish the Zionist regime.”

Commenting on the possibility of retaliation against Israel, Guards Commander Mohsen Rezaei said, “The decision has been made. It will definitely be implemented,” the semi-official Tasnim New website reported. He did not elaborate.

The funeral coincided with the annual Al-Quds (Jerusalem) Day, a day when Iran hosts large state-backed pro-Palestinian and anti-Israel rallies across the country.

According to Iranian media reports, Ziyad al-Nahara, leader of the Palestinian militant group Islamic Jihad, attended the rally in Tehran.

The strike was the boldest and deadliest in a series of strikes that have killed Iranian officials in Syria since December.

Iran has warned of harsh retaliation, raising fears of a wider war and prompting the Israeli armed forces to suspend furloughs for all combat units on Thursday, a day after they said they were mobilizing more troops for their air defenses.

Prime Minister Benjamin Netanyahu said on Thursday that Israel would harm “anyone who harms us or plans to harm us.”

In Tehran, the coffins of two slain Iranian officers were on display as people chanted religious mourning songs and waved Palestinian flags. All seven officers are expected to be buried later Friday.

Iran’s Jerusalem Day rallies are held annually on the last Friday of the Muslim holy month of Ramadan to support Palestinians who want east Jerusalem to become the capital of a future state in territory Israel captured in the 1967 war.