A new discovery of advanced centrifuge equipment in Iran, for enriching uranium to weapons grade, comes as absolutely no surprise to anyone except the United Nations and the International Atomic Energy Agency: U.N. Finds Enrichment Supplies in Iran.

A U.S. official, speaking on condition of anonymity, called the latest find “the second dramatic disclosure” in a row. “We knew that the Iranians were not completely clean, but we were willing to give them the benefit of the doubt.”

Iran insisted its intentions are peaceful and that its centrifuges are to process uranium for nuclear power, not warheads. Without explicitly acknowledging the discovery, Iranian Foreign Ministry spokesman Hamid Reza Asefi said any advanced “P-2” centrifuge system in the country was not in use but rather at a research stage.

One of the diplomats said the centrifuge was apparently located at an Iranian air base outside the capital — which would strengthen the arguments of the United States and other nations that Tehran is trying to make weapons.

But several other diplomats said they did not know where the equipment was found, and the Iranian government said there were no nuclear projects on any military base in the country.

Confronted by evidence last year, Iran acknowledged hiding nearly two decades of nuclear activity, including importing enrichment technology linked to the black market network of Pakistani scientist Abdul Qadeer Khan.