An investigation is underway to determine how 90 Ethiopian nationals were trafficked into South Africa.

The police found the undocumented persons in locked rooms at a property in Sunnydale Ridge, in Johannesburg.

Police spokesperson Brigadier Athlenda Mathe says they made the discovery after tracing a victim who was kidnapped for ransom.

The person was found at the property.

Two alleged human traffickers and kidnappers were arrested.