At least 30 people, including 19 policemen, have been killed in a spate of attacks in Sao Paulo, Brazil. Armed criminals targeted officers in 55 attacks in the early hours of Saturday. Authorities blamed the First Command of the Capital (PCC) faction. The attacks may be in response to a transfer of PCC inmates, analysts say.The attacks were followed by jail revolts, with 100 hostages being taken. The state governor insisted Sao Paulo would not bow to organised crime.