By Lindsey Hilsum

The Iranian regime beats, shoots and gases protesters in the capital wherever they try to demonstrate on the streets. Lindsey Hilsum reports.

Prepared for martyrdom, Iran's defeated presidential candidate Mir Hossein Mousavi has told supporters to stage a national strike if he gets arrested, according to reports from Tehran.

Mousavi claimed election-rigging had been planned months in advance and insisted the poll should be annulled.

As thousands defied a ban on public rallies, riot police fired tear gas, water canon and live rounds to disperse the crowds.

Our international editor, Lindsey Hilsum, who has been covering the post-election unrest in Iran, has had to leave the country.

She is now here, with the latest on the growing turmoil.