Protesters plan more mass rallies in Iran

By Parisa Hafezi

TEHRAN (Reuters) - Iranian demonstrators called for more mass protests on Tuesday, a day after hardline Islamic militiamen killed a man during a march by tens of thousands against a presidential election they say was rigged.

The Iranian capital has already seen three days of the biggest and most violent anti-government protests since the 1979 Islamic revolution after hardline incumbent President Mahmoud Ahmadinejad was declared winner of last Friday's vote.

"Tomorrow at 5 p.m. (1230 GMT) at Vali-ye Asr Square," some of the crowd chanted at Monday's march, referring to a major road junction in the sprawling city of some 12 million.

Further protests, especially if they are maintained on the same scale, would be a direct challenge to authorities who have kept a tight grip on dissent since the overthrow of the U.S.-backed shah after months of demonstrations 30 years ago.

U.S. President Barack Obama said on Monday he was "deeply troubled" by post-election violence in Iran.

"The democratic process, free speech, the ability of people to peacefully dissent -- all those are universal values and need to be respected," he told reporters.

The United States and its European allies have been trying to engage Iran and induce the world's fifth-biggest oil exporter to halt nuclear work that could be used to make an atomic bomb. Iran says it only wants nuclear energy to generate electricity.

Obama said he would continue pursuing tough, direct dialogue with Tehran but urged that any Iranian investigation of election irregularities be conducted without bloodshed. The world was inspired by the Iranian protesters, he said.