SYDNEY, Australia (AP) -- Australian Prime Minister John Howard will be involved in a mock siege in the national capital of Canberra on Wednesday as part of security preparations for the Sydney Olympics.
And Sydney will fall victim to "terrorists" using biological, chemical or radiological weapons.
The exercise, involving all arms of Olympic security and emergency services in both Sydney and the capital, will be the final dress rehearsal before the Games begin in September.
Participants in the three-day Exercise Ring True will include soldiers from the Special Air Service regiment and other defence force units, security agents, federal and New South Wales police and emergency services personnel.
"The prime minister will be involved in these exercises as well as some ministers," a spokeswoman for federal Attorney-General Daryl Williams said today.
Security services would "all be reacting as if it is a real incident," she said.
"There will be a mock siege in Canberra. Over the course of three days, chemical, biological or radiological weapons will threaten a site in Sydney."
The spokeswoman said that no specific terrorist threat towards the Games had arisen.