File Photo: U.S. President Donald Trump speaks during a National African American History Month reception at the White House in Washington D.C., the United States, Feb. 13, 2018. (Xinhua/Ting Shen)

UNITED NATIONS, May 20 (Xinhua) -- UN Secretary-General Antonio Guterres is very concerned about the rising rhetoric between Iran and the United States and warns that any action by either nation could be misinterpreted in a "very volatile region," his spokesman said on Monday.

"We are concerned about the rising rhetoric," the spokesman Stephane Dujarric replied, when asked about the increasingly heated exchange of comments between Tehran and Washington. "We saw the rocket launch that seemed to be aimed at the U.S. Embassy in Iraq, in Baghdad. That is also a concern."

Dujarric was asked about Iraq's concern that it could be caught in the middle of fighting between Iran and the United States.

"It is a very volatile region," he told correspondents at a regular briefing.

"We would ask all parties to lower the rhetoric and to lower the threshold of action as well," Dujarric said.

U.S. President Donald Trump tweeted over the weekend, "If Iran wants to fight, that will be the official end of Iran. Never threaten the United States again!"

But when asked by a reporter if the United States was going to war with Iran, Trump replied, "I hope not."

Iran's ambassador to the United Nations, Majid Takht-Ravanchi, sent a letter to the UN chief on Monday saying, "Iran will never choose war as an option in pursuing its foreign policy, but if war is imposed on us, Iran will vigorously exercise its inherent right to self-defense in order to defend its nation and to secure its interests."

File Photo: Iran's Supreme Leader Ayatollah Ali Khamenei speaks to students in Tehran November 3, 2009. (Xinhua/Reuters)

Tension between the two countries flared after a published report that the United States was preparing to send 120,000 troops to the Middle East in face of a threat from Iran.

Trump denied the report but said he would send a lot more than that number if there was going to be a fight.

The alleged threat came after the United States dispatched an aircraft carrier battle group and aerial bombers to the Persian Gulf region.

The heightened tensions followed Trump's announcement last year the United States was pulling out of the multi-nation, UN Security Council-endorsed Iran nuclear agreement, limiting Tehran's production of fissile material in exchange for an easing of UN imposed sanctions. European nations stayed in the accord with Iran.

In turn, Iran recently threatened to pull out of the accord entirely and renew production of the material that could be used for a nuclear weapon.