New counterterrorism units have been working at Australia's two largest airports since last week and had already intercepted a person of interest, the prime minister Tony Abbott said Wednesday. They would soon be introduced at all the country’s international airports, he said, to monitor movements of travelers on security watch lists – incoming and leaving the country. Biometric screening of passengers will also be introduced at all airports. The Australian government is giving high priority to reducing the domestic terrorism threat created by homegrown extremists who travel to Syria and Iraq to fight.