Photo: Citi building in London. Photographer: Chris J Ratcliffe/Bloomberg

Citigroup Inc.'s London trading desk was behind a "flash crash" that sent shares across Europe tumbling, dealing a fresh setback to the bank's years-long efforts to improve controls.

A trader at the U.S. firm made a mistake "inputting a transaction," Citigroup said late on Monday after a knee-jerk selloff in Swedish stocks in five minutes wreaked havoc in bourses from Paris to Warsaw. The bank said it identified the error "within minutes" and corrected it.

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