RIYADH (AFP) - Islamic states slammed as a war crime Wednesday Israel's shelling of a UN-run school in Gaza and called for the UN General Assembly to be convened to halt the 12-day-old assault on the territory. The Secretary-General of the Organisation of the Islamic Conference, Ekmeleddin Ihsanoglu, "strongly condemned the heinous crimes committed yesterday (Tuesday) when Israel targeted hundreds of unarmed civilians, including women and children, who took refuge in UNRWA schools in Gaza," a statement said. "The Secretary-General considered these Israeli attacks on civilians as war crimes whose perpetrators should be accountable in front of international justice." Ihsanoglu called for the Gaza crisis to be brought before the UN General Assembly "immediately" under the UN's so-called Uniting for Peace provisions after the Security Council failed to agree a response to the crisis. "By keeping silent and passive while these massacres are perpetrated, the international community is actually providing cover for Israel's crimes and encouraging it to carry through further crimes," he said. The organisation also strongly denounced a spate of suicide bombings in Iraq, saying such acts are contrary to Islamic teachings. Ihsanoglu said suicide bombings are "abhorrent criminal acts" and said that senior Iraqi Sunni and Shia scholars convened by the OIC "had rejected such acts as contrary to Islamic teachings and its noble values," according to an OIC statement. "Perpetrators of such heinous acts are the enemies of Islam," Ihsanoglu said. Iranian President Mahmoud Ahmadinejad, meanwhile, has sent 22 envoys to Europe and Asia to push for an immediate halt to Israel's offensive, the Mehr news agency reported. "Twenty-two members of the government have been sent by the President to European and Asian countries," Foreign Ministry spokesman Hassan Ghashghavi told the semi-official agency. The envoys would convey Iran's demand for "an immediate halt to the attacks by the usurper Zionist regime and an end to the blockade of Gaza," the spokesman added. The Mehr report did not specify which countries the diplomats would visit although Iranian newspapers said the list included Turkey. The Japanese government said Tehran asked Tokyo to play a larger role in opposing Israeli attacks. Iranian Foreign Minister Manouchehr Mottaki and his Japanese counterpart, Hirofumi Nakasone, held talks by telephone at Tehran's request, the foreign ministry said. Meanwhile, the movement of Moqtada al-Sadr, which fought two wars with US troops in Iraq in 2004, threatened to resume attacks on American targets inside Iraq over Washington's support for the Israeli assault on Gaza. "I ask the Iraqi resistance to engage in revenge operations against the US, the biggest partner of the Zionist enemy," Sadr said in a statement issued by his office in the central shrine city of Najaf.