A former undercover agent has made explosive claims that he shared intelligence with Australia's spy agency, ASIO, about gunman Naveed Akram's terrorist associations and alleged radicalisation, six years before the Bondi Beach attack.

The whistleblower told the ABC's 'Four Corners' program that the alleged murders of 15 people were the result of, quote, "a set of errors and disregard for information".ASIO says the claims were investigated and "found to be unsubstantiated"  

• Guest: Andrew Wilkie, independent Senator for Tasmania
• Producer: Jason Whittaker