Accusations of biological aggression is distracting the region from working together to defeat Covid-19.
The nine countries are the United Arab Emirates, Kuwait, Bahrain, Lebanon, Syria, South Korea, Egypt, Italy and Iraq.
A homemade explosive device that went off during a patrol in a Shia town also wounded two soldiers, the Saudi interior ministry said in a statement, describing it as a "terrorist incident."
The country's Interior Ministry says 12 Pakistanis & 7 Saudis have been detained in relation to attacks that day.
No group has yet claimed responsibility, but Saudi Arabia's Interior Ministry says all evidence points towards the DAESH terrorist group.
3 bombings occured outside Islam's second holiest site, the Prophet Muhammed's Mosque in Medina, the other near the US consulate in Jeddah & a third in the city of Qatif.
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