An Iranian-hosted international disarmament conference concluded Sunday with a demand that Israel join the Nuclear Non-Proliferation Treaty to assure a nuclear weapons-free Middle East.

The two-day conference followed closely behind a 47-nation nuclear security conference hosted by President Barack Obama in Washington last week, which excluded Iran and nuclear-armed North Korea. Washington and its allies suspect Iran's nuclear program is geared toward producing weapons, which Tehran denies.

As the conference was ending Sunday, Iran staged an annual military parade where it displayed missiles capable of carrying nuclear warheads.

The forum, which Iran said was attended by representatives of 60 countries, gave Tehran a platform for challenging Washington's assertion that it wants to see a world without nuclear weapons and for defending its own nuclear program.

It criticized what it called a double-standard by some nuclear powers that urge disarmament while ignoring the nuclear arsenal Israel is widely believed to possess.

"A nuclear weapons-free Middle East requires the Zionist regime to join the NPT," said the concluding statement of the conference read out by Iranian Foreign Minister Manouchehr Mottaki.

Israel, which does not confirm or deny possessing nuclear arms, has refused to sign the NPT, which would require it to open up its nuclear facilities to international inspectors.

The conference's statement, also took issue with perceived threats by the U.S. and Israel to attack Iranian nuclear facilities.

The conference expressed its concerns about the continued existence of Weapons of Mass Destruction - nuclear arms in particular - as well as their application or threat to apply them, the statement said.

Tehran was angered by Obama's announcement this month of a new U.S. nuclear policy in which he pledged America would not use atomic weapons against nations that do not have them. Iran and North Korea were pointedly excluded from the non-use pledge, and Iranian leaders took that as an implicit threat.

Iran's supreme leader, Ayatollah Ali Khamenei, told the conference's opening session on Saturday that the United States' atomic weapons are a tool of terror and intimidation.

Iran also used the weekend gathering to assert its frustration with international pressure to give up the central part of its own nuclear program, which Tehran says is of a peaceful nature and within its rights as a signatory to the NPT.

Israel, the United States and other nations believe Tehran is intent on developing an atomic weapons capability and want it to scrap an accelerating uranium enrichment program that could give Iran a weapons option. Iran denies such an aim and says it only wants to generate power and pursue other peaceful uses for the technology.

Iranian media said China, Russia, Pakistan, Iraq, Turkey and France, as well as delegates from international bodies and non-governmental organizations attended.

Also Sunday, President Mahmoud Ahmadinejad presided over an annual army parade in the capital to demonstrate the fruits of a military industry that he said could deter any attack.

Today, our armed forces have so much power that no enemy will harbor evil thoughts about laying its hands on Iranian territory, Ahmadinejad said.

Ahmadinejad proclaimed Israel a corrupt microbe on its way to collapse, in a speech marking Iran's annual Army Day.

Ahmadinejad said that Israel is the "main instigator of conflict" in the Middle East and that regional powers want it uprooted, the French news agency AFP reported on Sunday.

"The Zionist regime is on its way to collapse," said the Iranian president. "This is the will of the regional nations and that after 60 odd years, the root of this corrupt microbe and the main reason for insecurity in the region be pulled out."

Ahmadinejad, who is known for his anti-Israel rhetoric and Holocaust denial, called on the world to cease supporting Israel and its actions.

"I want [Israel's] supporters and creators to stop backing it and allow the regional nations and the Palestinians to settle things with them," he said.