PARIS, Oct 18 (Reuters) - Shares in French retailer Casino were down more than 3 percent on Thursday, extending earlier losses due to new concerns over the financial situation of its parent Rallye.
One trader cited a report by French magazine Challenges about possible accounting malpractices at Rallye.
Casino and Rallye had no immediate comments.
Casino shares have tumbled roughly 18 percent in 2018 on concerns about its debts and those of parent holding group Rallye.
Casino reports its third quarter sales after the market closes on Thursday.
Reporting by Blandine Henault, Dominique Vidalon, Pascale Denis; editing by Richard Lough