As more countries issued a terror attack warning, organisers of some of the major events taking place in Sandton, Johannesburg, at the weekend say they are going ahead with their plans.

Businesses in Africa’s richest square mile on Thursday said they were talking to authorities around security measures in and around the area following an alert that the US government had issued to its employees  at the US Consulate and citizens to avoid large crowds in Sandton following information it received...