Are mercenaries propping up the regime in Libya?

Sub-Saharan Africans have been blamed by many people in Libya for fighting to support Colonel Gaddafi.

Anti-government forces blame so-called 'African mercenaries' for the worst acts of indiscriminate violence.

Sabelo Gumedze, from the Institute for Security Studies in South Africa has been watching the situation closely.

On the line to Pretoria, BBC Focus on Africa's Sophie Ikenye asked him if he accepted the evidence that African mercenaries are indeed involved in the Libya crisis?