TEHRAN, Iran — Iranian police and plainclothes security officers mobilized Saturday to quell a third straight day of nationwide anti-government demonstrations that for the first time reached the capital, where the chants among protesters included: “Death to the dictator!” The bold reference to Supreme Leader Ayatollah Ali Khamenei — the all-powerful leader of a theocracy that…

Supporters of the Iranian government demonstrated Saturday in the capital of Tehran as anti-government protests entered a third day, spreading to other cities. The protests occurred as Iranian authorities issued another warning Saturday against “illegal gatherings.” A relatively small group of government protesters rallied at the University of Tehran but they were greatly outnumbered by thousands…