THE UK Serious Fraud Office (SFO) is investigating the sale of Cambridge-based firm Autonomy to Hewlett-Packard, the technology giant said in a filing last night.
It joins the US Department of Justice, which is already investigating Autonomy.
HP, which bought the British firm for $11.1bn (£7.4bn), took a massive write-down on its value last year and accused former Autonomy executives, including then-chief executive Mike Lynch, of accounting fraud.
Lynch has denied the allegations.
In a filing last night, HP said that on 6 February the SFO advised the firm that it had opened an investigation into Autonomy.
HP is due to hold its AGM in California this week.