FALLUJAH, Iraq (AP) — Tens of thousands of Iraqi Sunnis angry over perceived second-class treatment by the Shiite-led government massed along a major western highway and elsewhere in the country Friday for the largest protests yet in a week of demonstrations.

The well-organized rallies, which took place after traditional Friday prayers, underscore the strength of a tenacious protest movement that appears to be gathering support among Sunnis, whose sense of grievance has been increased by arrests and prosecutions that they feel underscore Shiite political dominance.