Custodian of the Two Holy Mosques King Salman bin Abdulaziz Al Saud has sent an invitation message to Oman's Sultan Qaboos bin Said to attend the Fourth Summit of Arab-South American Countries to be held in Riyadh in November. The invitation message was delivered by Saudi Ambassador to Oman Eid bin Mohammed Al-Thaqafi during a meeting today with Oman's Minister Responsible for Foreign Affairs Yusuf bin Alawi bin Abdallah.