By Ian Walker 

LONDON--The U.K.'s Financial Reporting Council on Monday said it has launched an investigation into Tesco PLC's accounts for fiscal 2012, 2013 and 2014, following the recent accounting scandal at the supermarket chain.

The FRC said it was investigating the parties involved in the preparation, approval and audit of Tesco's financial statements for the years in question, as well as their conduct in relation to accounting practices that led to a GBP263 million ($410.75 million) overstatement of the company's first-half profit forecast.

The FRC, which regulates corporate governance and reporting in the U.K., had previously said it was monitoring the situation.

The FRC's Financial Reporting Review Panel can require a company to restate its financial statements. The FRC also has the power to discipline accountants for misconduct.

Tesco first flagged issues with its accounts in September, suspending four senior executives and calling in outside auditors and legal counsel to investigate the overstatement of its forecast first-half profit. The issue resulted in the company issuing its third profit warning in as many months.

The company, which vies with Carrefour SA for the title of world's second-largest retailer behind Wal-Mart Stores Inc., has since suspended more executives and issued yet another profit warning earlier this month. Although Tesco remains the U.K.'s largest retailer by sales, its market share has been declining for years amid intense competition from aggressive discounters and high-end grocers.

PricewaterhouseCoopers, Tesco's longtime accounting firm and conducting the external audit, said it would work with the FRC. A person with knowledge of the matter said the FRC would be looking into both Tesco's accounting practices over the three years and the PwC audit. The person said that the FRC investigation was to be expected as it has been tracking the Tesco issue since September and "there is a clear public interest into this matter."

"We take our responsibilities very seriously and remain committed to delivering work to the highest professional standards. We will cooperate fully with the FRC in its enquiries," PwC said in a statement.

In October, the retailer said the accounting practices that led to the error had also occurred in prior periods.

The accounting practices in question involved the early booking of commercial income--or promotional money, discounts and rebates from suppliers--and delayed booking of costs, according to the company. Tesco, which has done a preliminary investigation into its U.K. food business, said it hasn't ruled out illegal activity but would wait until the results of the investigation are known.

The U.K. Serious Fraud Office has also opened a criminal investigation into Tesco's accounting practices.

Another person involved in the matter said the SFO was also looking to interview some of Tesco's main suppliers.

"Tesco's suppliers including Diageo and Unilever will likely be contacted by the SFO sometime in January," the person said.

"Since the Tesco issue involves promotions by its suppliers, the SFO wants to see whether the Tesco account on promotions is in line with what the suppliers understood or agreed," the person added, without elaborating.

Diageo PLC, the world's largest alcoholic drinks company, and Unilever PLC, the world's second-largest maker of consumer goods after Procter & Gamble Co., weren't immediately available for comment.

An SFO spokeswoman said the investigation into Tesco's accounts is continuing, without elaborating.

Tesco shares were down 1.5% to 184 pence in early afternoon London trading. The shares have rebounded from a 15-year intraday low of 155 pence reached Dec. 9, the day of the company's most recent profit warning.

Write to Ian Walker at ian.walker@wsj.com and Costas Paris at costas.paris@wsj.com

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