He said at the parliament "I can inform the House and inform the Australian public in general that forces have commenced combat and combat support operations." But he refused to discuss exactly what the Australian special forces troops were doing for operational and security reasons.

Experts believed the 150 commandos will be involved in deep reconnaissance work, positioned in Iraqi strongholds, far ahead of advancing coalition forces.

Howard said he had no doubt of the war's legality and asked Australians to unite to support the forefront troops.

Opposition Leader Simon Crean described the day as a tragic day for Australia. "This is a sad day, a sad day for the world, and it' s a tragic day for Australia," Crean said.

He said the prime minister should take responsibility for its consequence and said "This is a reckless, dangerous act. The prime minister should be hanging his head in shame as a result of it."

Tens of thousands of middle and high school students all over the country went out to streets to protest against the war, and more demonstrations are expected to follow up.

(Xinhua News Agency March 20, 2003)