MARCO ISLAND, Fla. - In a sign that a bureaucratic turf war may be under way, a senior bank regulator expressed serious reservations about rules securities regulators have proposed for bank brokerages.

The official, David P. Apgar, senior policy adviser to the comptroller of the currency, said that some of the rules proposed by the National Association of Securities Dealers are ill-conceived, and needlessly contradict guidelines federal bank regulators issued early last year.

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