"Islamic governments should designate the army of the occupying and aggressor regime as a terrorist organisation," Raisi told a summit of Arab and Muslim leaders in the Saudi capital Riyadh.

The emergency meeting of the Arab League and the Organisation of Islamic Cooperation (OIC) comes as Israel's relentless bombardment of civilian-packed areas has so far killed more than 11,000 people in the strip, many of them women and children, according to the Palestinian health ministry.

In his first visit to Riyadh since Iran and Saudi Arabia agreed to restore ties in March, Raisi urged nations that have ties with Israel to sever them and called for greater support for Palestinians.

He called for "cutting any sort of political or economic relations with the Zionist regime" as important steps to be taken by Islamic countries.

Implementing a "trade boycott against the Zionist regime especially in the energy field should be prioritised," he added.

The Iranian president, whose country supports Hamas, condemned the United States for providing financial and military support to Israel.

"Both the war machine of the Zionist regime and its fuel belong to the Americans," he said, adding that "undoubtedly, the US government is the commander and the main accomplice of this crime."