DUBAI, United Arab Emirates (AP) — Clashes between Iranian security forces and protesters angry over the death of a 22-year-old woman in police custody have killed at least nine people since the violence erupted over the weekend, according to a tally Thursday by The Associated Press.

The scope of Iran's ongoing unrest, the worst in several years, still remains unclear as protesters in at least a dozen cities — venting anger over social repression and the country's mounting crises — continue to encounter security and paramilitary forces.

To prevent protests from spreading, Iran's biggest teleco...