The revelations intensify concerns about repeated police decisions not to investigate 2015 trafficking claims.

William Ruto says Kenyans speak "some of the best English in the world" while it is hard to understand Nigerians.

A Ghanaian national was confronted by South Africans in a viral clip and questioned about his immigration status.

The widely circulated image had prompted authorities to move their search operation.

What court papers and sources close to the investigation have told the BBC about the scope of the plan.

Officials say the restrictions are for public safety, but businesses and the public are feeling the impact.