WASHINGTON - The Office of Thrift Supervision has delayed to Feb. 9 its decision on E-Trade Group Inc.'s application to buy Telebanc Financial Corp., a move the electronic brokerage said could sink the deal.

E-Trade of Menlo Park, Calif., needs regulatory approval to buy Telebanc, parent of Telebank, an Internet-only thrift based in Arlington, Va. Their June 1 deal allows either side to walk away if the merger is not completed by Dec. 31.

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