Ayatollah Ali Khamenei said Saturday that America deceptively calls for non-proliferation while holding on to its own weapons.

According to Iranian media, the two-day conference brought together representatives from 60 countries as well as delegates from international bodies and non-governmental organizations.

It appeared timed as a counterweight to President Barack Obama's 47-nation summit in Washington last week to discuss nuclear security. Obama did not invite Iran, which the U.S. fears is using a civilian nuclear program as cover to develop a weapons capability. Iran denies that.