The Afghans made their World Cup bow in Canberra against the Test-status South Asians, completing another step in their fairytale rags-to-riches story.

The war-torn country has taken to cricket with a passion and millions are expected to follow the match via TV, radio and social media.

With the match barely a quarter of the way through, the US embassy's official Twitter account posted a message hailing Afghanistan's "victory".

"Congratulations to #Afghanistan for their win over #Bangladesh in the Cricket World Cup #CWC15 #AFGvsBAN," the message said.

The tweet triggered a flood of sarcastic retorts about Americans in Kabul prematurely declaring victory, as well as an apologetic response from the embassy.

"Premature posting but we are still cheering for team Afghanistan at the #CWC15! #AFGvsBAN," the embassy tweeted.

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