Thomas Cook shares sink as Citi warns stock could hit zero

LONDON (Reuters) - Thomas Cook Group shares lost a quarter of their value on Friday and bonds hit a record low after Citi downgraded its rating to 'sell' and cut its target price on the stock to zero, in the wake of the company's latest profit warning. Shares in the world's oldest travel company, battered by fading demand for its package holidays and high levels of debt, hit 12.1 pence, their lowest since July 2012, and were on track for their biggest one-day drop since November 2011. Thomas..