Australian television has broadcast footage showing an American held hostage by Iraqi guerrillas.
The man is quoted in the film as saying he had been seized after a convoy was attacked.
Sitting in the back seat of a car beside a masked gunman and speaking with a southern American accent, the middle-aged man in casual civilian clothes identified himself as Thomas Hamill.
"They attacked our convoy," he said.
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The car then drove off down what the report said was Iraq's main western highway between Baghdad and Falluja, passing a burning tanker truck on the road.