Hundreds of Afghan soldiers have been fired or detained after a surge of insider attacks against NATO troops.
According to reports, Afghan personnel have opened fire on foreign troops -- most of them American -- 30 times so far this year, killing at least 45.
The latest insider attack involved three Australian soldiers, killed by a man wearing an Afghan army uniform. The man opened fire on the soldiers at the end of a long day of training Afghan soldiers.
Their bodies arrived back in Australia on Wednesday.
Australia's Army Chief told reporters what happened to the three was "murder."
The Afghan Defense Ministry called the attacks "a very serious matter," and said military leaders will use all of its resources to prevent these kinds of incidents.
U.S. Secretary of Defense Leon Panetta has called on Afghan President Hamid Karzai to crack down on the attacks.