Protests against Iran's clerical establishment appeared to have ended with no reports of demonstrators gathering in the capital for a tenth night.
Riot police and hardline Islamic vigilantes lined the streets in some trouble spots and intersections where protests, strongly endorsed by the United States, had erupted on previous evenings.
Unlike on most of the previous nine nights, when thousands of protesters crammed into cars blowing their horns and occasionally shouting slogans, traffic flows were normal on Thursday night and there was no sign of tension.
The official IRNA news agency and the student news agency ISNA carried no reports of protests in other cities.
Analysts said the protesters, who had voiced their anger at both reformist President Mohammad Khatami and the conservative clerics who have blocked his attempts at reform, had been intimidated into ending their protests because of the heavy security presence on the streets.
More than 300 people have been arrested in Tehran since the protests broke out last week. Dozens were injured when Islamic vigilantes armed with batons, chains and knives attacked students and demonstrators.
US officials hailed the protests as a cry for freedom leading to accusations of blatant interference from Tehran.