The US Government is to review reports claiming Iran test-fired a ballistic missile last month.
On 21 November, Iran test-fired a medium-range Ghadr-110 ballistic missile from a site in southeast Iran bordering Pakistan, reported Fox News.
US State Department spokesman John Kirby was quoted by the Associated Press as saying: "We're conducting a serious review of this reported incident.
"If the reports are confirmed and if there is a violation of any relevant UN Security Council resolution, then we're going to take the appropriations actions."
The testing is said to be the second in two months, despite a ban preventing the action under a 2010 Security Council resolution.
Prior to this, Iran had tested the missile in October, which lead to six countries calling for the Security Council's Iran Sanctions Committee to take action.
The UN had stated earlier that Iran reaffirmed 'that it will under no circumstances ever seek, develop or acquire any nuclear weapons'.
The resolution remains valid until the implementation of a nuclear deal between Iran and the six nations, namely China, France, Germany, Russia, the UK, and the US.
The committee has not taken any action against Iran for violating the UN resolution.
Kirby added that the US will monitor the situation, saying that is 'why we have a robust military presence in the region, and it's why we still have and will remain capable of having unilateral sanctions'.