The African Union has called on the Libyan authorities to investigate what was referred to as "slave markets" of African migrants who were trying to reach Europe via Libyan territory.

The request comes after a CNN report showing black migrants being traded in a public auction in Libya to work as servants in rural areas.

Guinean President and AU Chairman, Alpha Conde, has called for investigations and prosecutions of what he called "a heinous trade of past times."

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