This news becomes pressing as if Christine Lagarde is put under formal investigation as she might be forced to resign. The EU does not need another scandal that could distract from very delicate bailout proceedings.
French police have searched the Paris apartment of IMF chief Christine Lagarde, as they investigate her role in awarding financial compensation to businessman Bernard Tapie in 2008.
As finance minister, she referred his long-running dispute with bank Credit Lyonnais to an arbitration panel, which awarded him 400m euros (£340m) damages.
Mr Tapie was a supporter of ex-President Nicolas Sarkozy.
Critics say she abused her authority but Ms Lagarde denies any wrongdoing.
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