Iran said Tuesday that foreign ministers from 15 countries will take part in a two-day nuclear-disarmament conference to be held in Tehran April 17 and 18.

The Tehran conference comes just days after Washington 's high-profile nuclear-security summit, which is being attended by 46 world leaders. Iran , which is at loggerheads with the U.S. , isn't attending that summit.

"Foreign ministers from 15 countries and more than 200 foreign guests will take part in the Tehran conference," Iranian Foreign Ministry spokesman Ramin Mehmanparast told reporters. He didn't name the countries attending the meeting.

He said the conference was being held following a "collective will of some independent and free-willed nations to genuinely confront the use of nuclear weapons in today's world."

Mehmanparast dismissed the Washington summit, saying the host was the holder of one of the largest stockpiles of nuclear weapons in the world.

"Our people doubt such theatrical meetings as some nations have nuclear weapons, have used them, want to retain their arsenal and have impudently threatened to use them against other nations," he said, referring to the U.S. , which last week unveiled its new nuclear policy.

The policy limits Washington 's use of its nuclear arsenal, but singles out Iran and North Korea as exceptions, a move which has angered Iranian officials.

In recent months, Washington has spearheaded global efforts to impose new sanctions against Tehran for refusing to abandon its nuclear program.

Western countries suspect the program is aimed at making weapons, a charge vehemently denied by Tehran .

Iran is already under three sets of United Nations sanctions.

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