The usually bustling streets of Iran’s capital are largely empty as security forces reassert their control after crushing unprecedented protests against the country’s clerical rulers. Residents of Tehran describe a city under virtual martial law, with security personnel deployed on the streets and residents largely staying indoors. Many shops and restaurants close in the evening. “The feeling of martial law is completely in place at night," a man in his 70s who left Iran on January 17 told RFE/RL's Radio Farda. "One of the reasons…