Shares of Abercrombie & Fitch Co plunged 21 per cent recently and dragged down other stocks in the battered retail sector as the US teen apparel maker terminated talks over a potential sale. Investors saw Abercrombie’s failure to sell itself as yet another blow to a retail sector already struggling to cope with changing consumer tastes and growing pressure from Amazon.com Inc. and other online retailers. Shares of Gap Inc., American Eagle Outfitters Inc. and Express Inc. all fell more than 4 per cent.