The cause of a deadly fire that engulfed a five-storey building in Johannesburg, taken over for illegal housing remains under investigation. City and regional officials visiting the scene have vowed to hold those responsible accountable for the overnight blaze. ”If there is an official of the city who would be found to have contravened or to have neglected their responsibilities, heads will roll,” says Lebogang Maile, MEC for Human Settlements and Infrastructure Development for Gauteng. SOUNDBITES