Militants of the Islamist Justice and Charity Group, banned but tolerated by the government, were among the group.
Hundreds of pro-government protesters also gathered in Sidi Othmane, waving flags and portraits of King Mohammed VI, chanting: "Long live the King" and singing the national anthem.
The two groups were kept apart by the security forces, out in large numbers.
At the same time, more than 1,000 protesters gathered in the capital Rabat and several thousand in Tangiers.
The protests are inspired by similar movements that have toppled regimes in Tunisia and Egypt and by popular uprisings elsewhere in the Arab world.
They continue despite a referendum in which 98 percent of voters approved reforms proposed by the king, but boycotted by the February 20 Movement, which curbs the monarch's near-absolute powers.
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Hundreds of pro-government protesters also gathered in Sidi Othmane, waving flags and portraits of King Mohammed VI, chanting: "Long live the King" and singing the national anthem.
The two groups were kept apart by the security forces, out in large numbers.
At the same time, more than 1,000 protesters gathered in the capital Rabat and several thousand in Tangiers.
The protests are inspired by similar movements that have toppled regimes in Tunisia and Egypt and by popular uprisings elsewhere in the Arab world.
They continue despite a referendum in which 98 percent of voters approved reforms proposed by the king, but boycotted by the February 20 Movement, which curbs the monarch's near-absolute powers.
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