The survivors were arrested, Maleno wrote.
Las doce personas supervivientes están detenidas en aplicación de la ley de extranjerÃa marroquÃ. No hay derechos, ni siquiera piedad para las migrantes.
— Helena Maleno Garzón (@HelenaMaleno) May 8, 2022
The bodies of seven victims were brought back to shore but the others could not be retrieved, she added.
There was no immediate confirmation from authorities in Morocco, which sees the disputed Western Sahara as an integral part of the North African kingdom.
It was not clear where the boat was heading, but usually migrants leaving from that area try to reach Spain’s Canary Islands.
Morocco is a key transit point on routes taken by migrants hoping for better lives in Europe.
On Friday, Morocco and Spain said in a joint statement they were committed to strengthening cooperation on irregular migration.
More than 14,700 attempted irregular departures were prevented and 52 human smuggling networks broken up in Morocco during the first three months of this year, according to interior ministry figures.
Moroccan authorities stopped more than 63,120 crossings last year and shut down 256 smuggling networks.
According to the Spanish interior ministry, more than 40,000 migrants arrived in the country by sea in 2021.
That same year, according to Caminando Fronteras, 4,404 migrants died or went missing as they tried to reach Spain.