The Iranian government carried out a medium-range ballistic missile test Sunday that may be a violation of a United Nations Security Council resolution, US officials said. Iran says its missiles are key to deterring a US or Israeli attack.

In a background briefing after the statement, senior administration officials emphasized that what they called Iranian "provocations", and the threat to do something about them, were unrelated to the nuclear agreement.

Some U.S. lawmakers who have questioned the nuclear deal were quick to praise the administration for taking a tough line. Sen.

"No Iranian missiles have been produced to carry nuclear warheads", said Zarif, speaking at a joint news conference held with Ayrault in Tehran.

Iran's United Nations mission issued a statement reiterating Tehran's position that "Security Council Resolution 2231 does not prohibit legitimate and conventional missile activities".

The Shahab-3 was launched as part of a military exercise, according to one official.

Iran is only using ballistic missiles to defend itself, he added.

The Iranian government has carried out a medium range missile test launch.

"We're looking into that", he said.

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That resolution ratified a July 2015 accord between Iran and six world powers under which it scaled back its nuclear activity to defuse concerns it could be put to making atomic bombs; in return, Iran won relief from crippling economic sanctions.

Suzanne Maloney, deputy director of the foreign policy program at the Brookings Institution, said that there is widespread global consensus, without the United States, that Iran's missile test is not an explicit violation of the resolution, but that "there is a wider consensus about the undesirability of Iran's missile activities than there is about how to respond". It's a deal which President Donald Trump, has called " the worst ever negotiated". "Iranian aggression must not go unanswered", he said.

"We have said with this administration that we are not going to show a blind eye to these things that happen", Haley said.

Britain's United Nations ambassador, Matthew Rycroft, said the Security Council chose to refer the test to its committee dealing with Iranian issues and asked for an investigation.

Channel 10 said the Khorramshahr is a Russian-developed missile originally intended for submarine launch that is capable of carrying a nuclear warhead. The powerful Revolutionary Guard is in charge of Iran's ballistic missile program.

The U.S., which still maintains its own set of sanctions against Iran, has argued that previous ballistic missile launches are in defiance of the ban.

Meanwhile, the European Union called on Tehran to "refrain from activities which deepen mistrust".

"Whether it constitutes a violation is for the Security Council to determine", she said.