The United States issued a pre-emptive warning to Iran on Thursday against pursuing three planned space rocket launches that it said would violate a U.N. Security Council resolution because they use ballistic missile technology.

Iran rejected the warning, issued by U.S. Secretary of State Mike Pompeo, saying its space vehicle launches and missile tests were not violations.

Pompeo said Iran planned to launch in the coming months three rockets, called Space Launch Vehicles (SLV), that he said incorporate technology "virtually identical" to what is used in intercontinental ballistic missiles.