Supporters of Iran’s defeated presidential candidate Mir Hossein Mousavi have held another big rally in northern Tehran, witnesses say. The protest came hours after Mr Mousavi urged them not to march in the centre of the city where President Mahmoud Ahmadinejad’s supporters were rallying. Tough new restrictions on the foreign media mean the BBC is unable to confirm the scale of the opposition protest. It came despite an offer to recount votes the opposition disputes. The new media restrictions have been imposed amid apparent surprise and concern among the authorities at the scale of popular defiance over Friday’s official election results, correspondents say.