Ana Maria de Jesus,52,and Larissa de Jesus Castilho,21,fell ill and died after eating a cake which was allegedly laced with pesticides
At least one person is seriously hurt.
The singing had been playing for five and a half hours by the time firefighters managed to stop it.
Errol Musk has categorically denied the accusations.
'The scene was horrific. We all froze from that first moment we stepped into the pit and saw so many corpses superficially buried there.'