Allegations by members of the Securities industry Association that banks are illegally "tying" services have prompted action by federal banking regulators, but a lack of sufficient evidence is hampering their effort, the general counsel to the Office of the Comptroller of the Currency said yesterday.

"It is difficult to track down [the allegations] because most dealings are not done in writing, so there is no ~smoking gun'," said William P. Bowden Jr., the federal regulator's general counsel. "We have made requests from the SIA to provide us with specifics, but we've got very little."

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