Iran faces a defining moment not only in its current political crisis but even in the life of the regime itself today – if protesters defy a stern warning by Iran’s Supreme Leader. Ayatollah Ali Khameini drew a line in the sand yesterday at Friday prayers in Tehran saying mass protests had to end.He said: “Fighting on the streets after the elections is not acceptable and undermine democracy. I call on all parties involved to put an end to these events. “Failing that, the organisers of these events will be held directly responsible for a possible bloodbath. “ So far defeated Presidential candidate Mir Hussain Mousavi has not called on supporters to take to the streets again today. But they may turn up anyway as they did earlier this week when he asked them to stay at home Also today Mousavi will meet with Iran’s top legislative body, the Guardian Council, to look at alleged irregularites in the recent presidential elections. Images emerging from various flashpoints in recent days have shown a disturbing degree of violence. Now every Iranian knows after the Supreme Leaders warning, the potential for a bloodbath has suddenly become very real.