Thousands of people have marched in Moroccan cities to demand that King Mohammed VI give up some of his powers.
In the capital, Rabat, police allowed protesters to approach parliament, chanting slogans like “The people reject a constitution made for slaves!”
A separate protest is under way in the country’s biggest city, Casablanca, and another was planned in Marrakesh.
Protests have spread across the region since popular movements in Tunisia and Egypt forced out leaders.
Sunday’s rallies in Morocco are organised by groups including one calling itself the February 20 Movement for Change.
More than 23,000 people have expressed their backing for its Facebook site.