A bus failed to make a curve and plunged 10 metres down a hill late Sunday in southern Brazil, killing 15 people, dpa reported. Thirty-two passengers were injured in the accident near Sao Lourenco da Serra, 50 kilometres south of Sao Paulo. The driver was suspected of falling asleep at the wheel, a police spokesman told the news portal G1. The bus was travelling from Curitiba to Rio de Janeiro when the accident happened.