Tens of thousands of residents were ordered to evacuate coastal areas in the north eastern United States today as big cities and small towns across the US Northeast braced for the onslaught of a superstorm threatening some 60 million people along the most heavily populated corridor in the nation.

Fights and rubbish fires broke out, rescue helicopters were shot at and anger mounted across New Orleans today, as National Guardsmen in armoured vehicles poured in to help restore order across this increasingly desperate and lawless city.