Thousands of people have demonstrated in the Northern Moroccan City of Al-Hoceima, demanding the release of a well-known activist.
Reports say riot police were involved in a tense stand-off with protesters, but later retreated.
Protesters rallied after Nasser Zefzafi was arrested on Monday charged with threatening national security.
Mr Zefzafi has organised months of protests against unemployment and corruption.
Thousands of protesters took to the streets accusing the authorities of corruption, abuse and injustice.