A man in police uniform has shot and killed 10 officers in south-west Afghanistan.
Two separate attacks by Afghan personnel earlier took the lives of six United States soldiers in Helmand province.
A civilian employee shot three soldiers at a base on Friday and a police officer shot three marines after inviting them to dinner at a checkpoint.
The killing of two British soldiers in Helmand was also announced on Friday.
The ABC reports the latest incident happened in the south-western province of Nimroz.
Officials described the killer as a Taliban infiltrator.