WASHINGTON – Regulators delivered yet another blow to a battered industry on Tuesday as the Securities and Exchange Commission said it has found abusive mutual fund share sales practices at 13 of 15 broker/dealer firms it recently examined in regards to "revenue sharing" arrangements.

An SEC spokesman said that eight of the broker/dealer firms and 12 of the mutual fund firms that have participated in the arrangements are under active investigation. The agency does not release the names of firms that are under investigation if an enforcement action is not shortly forthcoming, the spokesman said.

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