Tehran denies there was any secrecy involved, and that the plant hadn't reached the point where the government needed to disclose its existence.

VOA: standard.2009.09.28

Tehran was also summoned to disclose any other secret nuclear activities.

VOA: standard.2009.11.28

"I have asked the members of the inquiry that the final report of the inquiry will be able to disclose all but the most sensitive information, that is,all information except that which is essential to our national security,"

VOA: standard.2009.06.15

"I do not want to disclose publicly the information we are getting, but we are intensively engaged through a whole variety of different channels, but I do not disguise the fact that we are extremely concerned for the safety of the hostages,"

VOA: standard.2009.07.29