An Arab League summit called on Sunday for an global probe into the "criminal" use of chemical weapons in Syria and condemned what it saw as Iran's interference in the affairs of other countries.
Delegates pledged in the closing statement to support the Palestinians and ensure regional security with a call for regional actors to respect Arab sovereignty and for militias to disarm.
"East Jerusalem is an integral part of Palestinian territories", he stressed before the gatherers from across the Arab world.
Saudi Arabia on Saturday declared its full support for US-led air raids on Syria, which the Pentagon said had "successfully hit every target".
Jerusalem remains at the heart of the Middle East conflict, with Palestinians hoping that East Jerusalem - occupied by Israel since 1967 - might eventually serve as the capital of a Palestinian state.
The Qatari delegation is being headed by Doha's permanent representative to the Arab League, Saif bin Muqaddam al-Buainain, Qatar's state news agency said, without elaborating.
THERE have been 40 summits of Arab leaders in the last 70 years.
"We renew our strong condemnation of terrorist acts carried out by Iran in the Arab region, and we reject its blatant interference in the internal affairs of Arab countries", King Salman said at a summit of Arab leaders, without referencing Friday's missile strikes on Syria, according to Reuters.
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Arab ministers at a preliminary meeting in Riyadh on Thursday focused heavily on blocking the move, unanimously condemning Trump's decision.
Earlier this month, the monarch reiterated the kingdom's "steadfast stance on the Palestinian issue and the legitimate rights of the Palestinian people to an independent state with Jerusalem as its capital".
The two rivals are engaged in proxy wars in Yemen and Syria but also back opposing sides in Lebanon, Iraq and Bahrain.
Iran is backing Houthi rebels that Riyadh opposes in Yemen and on Sunday Salman praised "the UN Security Council's statement denouncing the Iranian-made ballistic missile fire on Saudi cities".
The summit also agreed on the necessity to secure the Arab World from the dangers terrorism poses and to work on combating terrorism and supporting all security, economic, social, cultural and intellectual means to preserve the Arab World's national security.
"We urge the worldwide community to sanction Iran and forbid it to back Houthi terrorists and provide them missiles", the statement said.
Ahmed Aboul Gheit, secretary-general of the Arab League, said that the serious crises in the region facilitated foreign interference.