WASHINGTON - The drive to uncover examples of illegal bank "tying" in the municipal securities market intensified yesterday as the Securities Industry Association asked its 650 members to supply concrete evidence of the practice to regulators.

"I am writing to seek your help to stop illegal tying of products and services by commercial banking organizations that compete unfairly with the securities industry", Austin Koenen, chairman of SIA's investment banking committee, said in a two-page letter to association members.

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