Indian Prime Minister Manmohan Singh Monday left here for Pretoria, South Africa, to attend the 5th India-Brazil-South Africa Summit, said local media reports. The summit is expected to focus on global security, economy, climate change and UN reform, according to the reports. Singh is accompanied by Indian Minister of External Affairs S.M. Krishna, Minister of Commerce and Industry Anand Sharma and his Principle Secretary Pulok Chatterjee.