Saudi Arabia is doing its best to avoid war in the region but stands ready to respond with "all strength and determination" to defend itself from any threat, the Kingdom's top diplomat said on Sunday.
A rocket has exploded in the Iraqi capital's heavily fortified Green Zone, home to government headquarters and the US Embassy.
The warning comes amid simmering tensions between the United States and Iran.
Iraqi military spokesman Brig.
The monument lies in open ground about half a kilometre (a third of a mile) north of the sprawling, riverside US Embassy compound.
Police were now searching for suspects and the rocket launcher in the eastern district of New Baghdad, he said.
The U.S. embassy in Baghdad and its consulate in the northern city of Erbil evacuated non-essential staff this week, following the escalating tensions with Iran.
Sen. Marco Rubio (R-FL) described the threats from Iran as a "serious and potentially imminent threat to US forces" and said Trump was correct in moving military assets to the region to be "position to retaliate" if Iran or any of the proxy terrorist groups it supports should launch any kind of attack.
On Sunday, the U.S. Navy said it conducted exercises in the Arabian Sea with the USS Abraham Lincoln carrier strike group together with the U.S. Marine Corps, demonstrating "lethality and agility to respond to threat".
Trump campaigned on pulling the USA from the deal, which saw Iran agree to limit its enrichment of uranium in exchange for the lifting of economic sanctions.
Iran has said it would resume enriching uranium at higher levels if a new nuclear deal is not reached by July 7.
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Elsewhere in the Gulf, Bahrain warned its citizens against traveling to Iraq or Iran due to "unstable conditions".
Muraikhi said Doha - which remains isolated by neighbouring former allies in a long-running diplomatic dispute - has not yet received a formal invitation to either meeting.
Oil supplies are sufficient and stockpiles still rising despite massive output drops from Iran and Venezuela, said Saudi Arabia and the United Arab Emirates said at the meeting in Jeddah. Oil is now trading above $70 a barrel and closer to what's needed to balance state budgets among Persian Gulf producers.
Since then, four oil tankers, including two belonging to Saudi Arabia, were targeted in an apparent act of sabotage off the coast of the United Arab Emirates, according to officials in the region, and Iranian-aligned Houthi rebels from Yemen attacked a Saudi pipeline.
Iran has denied it carried out either attack.
He did not give details on the nature of the threat from Iran, but warned that the United States would use "unrelenting force" should Iran stage an attack on its troops in the region.
Though additional USA forces have been deployed to the region and though Iran has reportedly been readying its conventional and proxy forces for possible attacks, both sides have said they do not want war. "The ball is in Iran's court and it is up to Iran to determine what its fate will be".
"We have some indications and we will make the announcements once the investigations are complete", he said.
Crown Prince Mohammed bin Salman discussed regional developments, including efforts to strengthen security and stability, in a phone call with U.S. Secretary of State Mike Pompeo, the Saudi Media Ministry tweeted on Sunday. There was no immediate statement by the State Department about the call.
Despite worldwide scepticism, the United States government has cited increasing threats from Iran, a long-time enemy of both Washington and its regional allies, including Israel and Saudi Arabia.
"We are not pursuing war but we are also not afraid of war", Major General Hossein Salami was cited as saying by the semi-official news agency Tasnim.
U.S. House Democrats have invited former Central Intelligence Agency director John Brennan to speak about the situation in Iran next week.