Three former Tesco executives have been charged with fraud in connection with an accounting scandal that rocked the British supermarket giant two years ago, investigators said on Friday.

The charges stem from a criminal investigation dating to October 2014, after the company announced that it had overstated its first-half profit by 263 million pounds, about $420 million at the time, and that it had suspended several executives for accounting irregularities.

Christopher Bush, the former head of Tesco’s British business, and two former executives in that unit, Carl Rogberg and John Scouler, face charges of fraud by abuse of position and false accounting, the Serious Fraud Office, which investigates fraud in Britain, said in a statement.

The fraud office said the possible wrongdoing took place between February and September 2014. The men are to appear in court on Sept. 22, and the investigation is continuing, it said.