Foreign journalists who arrived in Iran last week to report on that country's election are being forced to leave the country after authorities refused to renew their one-week visas, the New York Times reported today (Thursday). Steve Capus, president of NBC News, told the Times that "it is enormously difficult right now" for the network to cover the continuing demonstrations in the country. Loren Jenkins, senior foreign editor for NPR, noted that the visa for the public radio network's correspondent had expired on Wednesday. "I think they want everyone [journalists] out of there so they can crack down," he said. The BBC, however, maintains a permanent correspondent in Tehran. However, his reports have included strong criticism of the elections by Ahmadinejad's opponents, and some suspect that his visa may be withdrawn. Like other journalists, he has not been permitted to cover the recent anti-government demonstrations. In an email message, Jim Sciutto of ABC News said that until Tuesday, he had taken "the risk of filming on our cellphones. But now the message seems to be 'don't even think about it.'" Nevertheless, "citizen journalists" are uploading video of the demonstrations -- and the crackdown -- onto Twitter and other Internet sites, leading former CBS anchor Dan Rather to echo a remark that he said, "seems to be cropping up everywhere " "The revolution may not be televised, but it very well could be Twittered."