Two busy beaches were shut following the attack near Sydney.
The clampdown appears to be aimed at British fans.
'It will be the inflection point where we move into a different regime.'
One responder was filmed in a hazmat suit wiping what appeared to be a stain on a wall at Ginza Six shopping complex.
Two teams faced intense security screenings while travelling to the World Cup.
Damage was seen inside the power station's exclusion zone.