Gangster violence plunges Sao Paulo into chaos,..

SAO PAULO, Brazil (Reuters) - A wave of gangster attacks in the Brazilian state of Sao Paulo in which at least 81 people, many of them police, have been killed in four days forced schools, shops and offices to close early and disrupted public transport in the world's third largest city on Monday.

Gun-toting policemen manned checkpoints on main roads after the violence which broke out on Friday in retaliation for the transfer of jailed crime bosses and other gang members to a remote prison. orig arti By Angus MacSwan