A month after U.S. military officials said Iran fired and missed twice at an American drone in the Persian Gulf, Iran said on Monday that it had captured a drone flying over the same waters.

An Iranian military official on state television said such drones usually fly off of warships. The U.S. Navy said all of its drones had been accounted for, but the CIA and NSA also use drones. The U.S. State Department on Tuesday denied the report as well, but deferred specific questions to the Pentagon.

"We have no evidence that the details are true," a spokesman said.

“The new US failure in spying operation by this drone demonstrated that the US government, despite its high military and economic power and its dominance on the world political order, is not capable of confronting the Islamic Iran, and Iran can easily undo all its plans,” Iranian Revolutionary Guard Corps Brigadier General Hossein Salami said on Tuesday to Iranian state television.

The U.S. has been using drones to keep a watchful eye on installations Iran is said to be using to develop nuclear weapons.