Iran's supreme leader, Ayatollah Ali Khamenei, issued a stern warning to opponents today to stay off the streets as he denied claims that last week's elections had been rigged.

In an uncompromising address at Friday prayers, Khamenei claimed that the high turnout at the elections showed how much the Iranian people supported the regime, and blamed western powers for interfering in Iranian politics

The speech now creates a clear dilemma for Mousavi and his supporters: do they return to the streets in open defiance of Khamenei or drop their demands? Prior to today's speech, Mousavi had called on the opposition movement to gather in Tehran tomorrow afternoon for a rally, but many may now feel too fearful of a crackdown by the authorities.