BETWEEN 1999 and 2011 São Paulo's murder rate fell by almost three-quarters, turning what had been one of Brazil's most dangerous states into one of its safest. Now the violence is rising again. In the past two months more than 300 people have died in the state capital in an undeclared war between police and the Primeiro Comando da Capital (PCC), a drugs gang, twice the tally for the same period last year.