Australian Prime Minister Scott Morrison said he was seeking an apology from China after a diplomat in Beijing tweeted an image purporting to show an Australian soldier holding a knife to the throat of an Afghan child.

The tweet, posted by Chinese Foreign Ministry spokesman Zhao Lijian, was "repugnant,” Morrison told reporters in Canberra on Monday. The Australian premier said the image was doctored and called for Twitter to remove it.

"The Chinese government should be totally ashamed of this post,” Morrison said. The tweet will diminish China’s global reputation, he said.