Harriet Green
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Thomas Cook chief resigns saying her work 'is complete'

Thomas Cook chief executive Harriet Green has resigned, saying her work at the travel firm "is complete".

Shares in the travel company plunged more than 20% in reaction to the news. The company also warned of tougher market conditions in the coming year.

Ms Green will be replaced by chief operating officer Peter Fankhauser, who will take over with immediate effect.

The BBC's business editor Kamal Ahmed explains.

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