Bosses at computer giant Hewlett-Packard took a £5.5bn hit after accusing former staff at a Cambridge software company it bought last year of misleading investors.
HP bought Autonomy in a £7.1 billion deal that saw its founder Dr Mike Lynch pocket around £500 million.
The American firm alleges that former members of Autonomy's management fiddled accounts in a bid to "mislead investors and potential buyers" and has referred the matter to the Serious Fraud Office (SFO).
More top news
New Norwich City signings Andre Wisdom and Robbie Brady have been facing the cameras for the first time since joining the club.
18 month operation leads to drugs gang being jailed
A large fire that engulfed a popular Norfolk seafront is now under control, the local Fire Service has confirmed.