Western intelligence said the test was held on November 21 near Chabahar, a port city in Iran's Balochistan province near the border with Pakistan, Fox News reported on its website.
It cited the US official, who spoke on condition of anonymity, as saying that the new test was in breach of two UN Security Council resolutions.
In October, Iran's defence ministry said it has successfully test-fired the country's first long-range missile that can be guided and controlled until hitting the target.
The White House took notice of the ballistic missile test that month, saying "strong indications" showed that Iran's test of a new precision-guided ballistic missile violated a UN Security Council resolution.
"We've got strong indications that those missile tests did violate UN Security Council resolutions that pertain to Iran's ballistic missile activities," said White House press secretary Josh Earnest said.
He pledged the US will work with its world partners "to engage a strategy to try to disrupt continued progress of their ballistic missile programme".
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