"Australian authorities are working together with international partners to identify and mitigate threats, including by preventing Australians to travel overseas to undertake terrorism-related activity," he said.

Intelligence officials say that he flew to Damascus with his brother, Boubaker, 21, who is wanted for questioning by the French antiterrorist police because of his association with a group suspected of terrorism-related activities in France.

Mohammed has testified as an "expert witness" for the prosecution in cases involving allegations of terrorism-related activities.

In 1994, while Celil was living in Xinjiang, he was arrested, charged with several murders and terrorism-related activities, and imprisoned by Chinese police.

Aldosary, allowed entry as a refugee, was denied a Green Card based on his "terrorism-related activities" as an insurgent fighting Saddam Hussein in 1991.

Control orders may contain restrictions that the Home Secretary or a court "considers necessary for purposes connected with preventing or restricting involvement by that individual in terrorism-related activity", including:

Although intended to be more flexible and to focus more on the investigation of the individual suspected of terrorism-related activity with increased judicial oversight, they have been dubbed as mere re-brandings of control orders.

The program has established a standardized process whereby SARs can be shared among agencies to help detect and prevent terrorism-related criminal activity.

She would not specify whether Washington had detected terrorism-related activity or signs of illegal technology transfer in the checking process.

Several Afghan refugees have been accused or arrested by Pakistani authorities for being involved in terrorism-related activities inside Pakistan.