PITTSBURGH, United States, Sept. 25 (Xinhua) -- The leaders of the United States, Britain and France on Friday condemned Iran's alleged secret nuclear site and demanded the country "take concrete steps" to comply with related U.N. resolutions.

U.S. President Barack Obama (R) holds a news conference with France's President Nicholas Sarkozy (L) and British Prime Minister Gordon Brown at the G20 Summit in the Pittsburgh Convention Center in Pittsburgh, Pennsylvania, September 25, 2009. Iran has told the U.N. nuclear watchdog that it has a second uranium enrichment plant under construction, a belated disclosure sure to heighten Western fears of a stealthy Iranian quest for nuclear arms capability. (Xinhua/Reuters Photo) Photo Gallery>>>

    U.S. President Barack Obama told a news conference before the plenary session of the Group of 20 Summit that the three countries had presented "detailed evidence" to U.N.'s nuclear watchdog that "Iran has been building a covert uranium enrichment facility."

    Iran's newly-unveiled uranium enrichment facility "is inconsistent with a peaceful (nuclear) program," Obama said.

    "Iran is breaking rules that all nations must follow," he added.

    British Prime Minister Gordon Brown and French President Nicolas Sarkozy made similar remarks at the news conference.

    Brown said that news of Iran's covert nuclear facility should "shock and anger" the world.

    The British prime minister said that the international community has no choice but to "draw a line in the sand" by demanding that Iran abide by U.N. resolutions and open the facility to inspections.

A view of what is believed to be a uranium-enrichment facility near Qom, Iran, is seen in this satellite photograph released September 25, 2009. Iranian President Mahmoud Ahmadinejad said Friday the United States, Britain and France would "regret" accusing Iran of hiding a nuclear fuel facility, saying it was not a secret site. (Xinhua/Reuters Photo) Photo Gallery>>>

    Brown said that Iran's actions have "hardened the resolve of nations concerned" about its nuclear plan.

    The French president warned that Iran faces possible new international sanctions if it doesn't come clean on its nuclear program by December.

    He said that Iran was in clear violation of U.N. resolutions in building a second plant to manufacture nuclear fuel and in trying to hide it from the world for years.

    Sarkozy said the new crisis threatens the entire international community.

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