Saudi Foreign Minister Adel al-Jubeir told reporters that the Arab leaders strongly condemn the use of chemical weapons and are demanding an independent global probe to clarify who is responsible.
Seventeen leaders from across the Arab world - minus Syrian President Bashar Al Assad - gathered in the eastern Saudi city of Dhahran for the summit, which this year comes as world powers face off over Syria and tensions rise between Riyadh and Tehran.
The summit took place in Saudi Arabia on Sunday, a day after the coordinated attacks by the US, UK and France on three sites allegedly linked to the production of chemical weapons in Syria.
"We state decisively about our harsh condemnation of the use of chemical weapons against the friendly Syrian nation and demand to hold an independent worldwide probe and to implement global law in regards to those, whose responsibility for the use of chemical weapons will be proven", the final statement reads.
"The Saudis are going to push for a much harsher stance on Iran-not necessarily on the nuclear dossier per se, but on Iranian influence in the Arab countries, particularly Iraq, Syria, Lebanon and Yemen", said Karim Bitar of the Paris-based Institute of worldwide and Strategic Affairs.
Saudi Arabia and allies expressed support for the strikes on Saturday, but Iraq and Lebanon have condemned them.
The photo showed Saudi Crown Prince Mohammed bin Salman, Egyptian President Abdel-Fattah el-Sisi, Bahraini King Hamad bin Isa al-Khalifa, Jordanian King Abdullah II, Abu Dhabi Crown Prince Sheikh Mohamed bin Zayed, Dubai Ruler Sheikh Mohammed bin Rashid, Head of Saudi sports Turki al-Sheikh, Saudi Royal Court Advisor Saud al-Qahtani, and Head of Egypt's General Intelligence Service Abbas Kamel.
Military help over the past three years from Russian Federation and Iran, which also backs Lebanon's Hezbollah group and Shi'ite Muslim militias in Iraq, has allowed Syrian President Bashar al-Assad to crush the rebel threat to topple him.
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"We hold the Iran-backed Houthi militias fully responsible for the emergence and continuation of the Yemeni crisis and the human suffering that has afflicted Yemen", the King Said.
The summit also issued the "Dhahran Declaration" which brought the viewpoint of the Arab leaders on the issues related to the region.
King Salman, who travels rarely because of his declining health, said: "We reiterate our rejection of the U.S. decision on Jerusalem".
In a statement on Sunday, Bahram Qassemi reiterated Iran's principled policy of non-interference in the internal affairs of other countries. Doha denies the charges and says the boycott is an attempt to impinge on its sovereignty.
While Qatar's emir did not attend the summit, the country's Arab League representative was present at the meeting.
Sheikh Tamim returned to Doha on Saturday from a U.S. trip where he met Trump.
Ahead of the summit, the four boycotting nations said their demands - including closing the Al Jazeera television station and reducing ties with Iran - were "a necessary basis" for a resolution to the crisis with Qatar.