
Islamic schools, known as Almajiris, are common across the north of the West African country. Such schools have for years been dogged by allegations of abuse and accusations that some children have been forced to beg on the streets of cities in the north.

Nigeria launched a crackdown on informal Islamic schools and rehabilitation centres in late September after a man was refused permission to see his nephews at one institution and complained to the police.

After the captives were released showed a group of mostly young men and teenage boys. Few infants were also among the group. According to allegations, were forced to beg on the streets.

The captives appeared to be malnourished were given one meal a day and the food wasn't even fit for a dog to eat.

Many captives have said they were physically and sexually abused and chained up to prevent them from escaping.

Some people were locked inside a building and some were chained.

Oyo's commissioner of police, Shina Olukolu, said that anyone found culpable would be prosecuted to "serve as a warning to others who may want to operate such houses that serve as illegal detention centres".