The ABC is working to understand what is causing its flagship show Radio National to go silent after listeners were met with more than an hour of dead air. 

The broadcast went quiet shortly after 8am (AEDT) online and on the ABC Listen app.

In a statement, the national broadcaster apologised for the inconvenience and said it is working to resolve the issue.

“The ABC is aware of an issue which began after 8:00am AEDT this morning and is impacting Radio National and other audio services on broadcast and streaming services including ABC listen,” an ABC spokesperson told 9news.com.au.

“The ABC apologises for any inconvenience caused and we are working to resolve the issue as soon as possible.”