In running clashes with the demonstrators, baton-wielding police prevented them from gathering in front of the Moroccan parliament in the centre of the capital Rabat, injuring several people including journalists.
The convicted pedophile is among 48 jailed Spaniards who were pardoned by King Mohamed VI on Tuesday at the request of Spain's King Juan Carlos, who visited Morocco last month.
"We are here to know who is responsible for that pardon. It is a shame, they are selling our children," Najia Adib, president of Don't Touch My Children association, told Reuters moments after she and her teenage daughter had been attacked by riot police.
The demonstration followed an online campaign by outraged activists. Protests were also reported in several other cities in the North African country.
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