Executive Life Insurance Co.'s tumbling dominoes have threaded their way through insurance regulators, investment bankers, state legislators, employee retirement plans, institutional bond buyers, the Internal Revenue Service, and now the Securities and Exchange Commission, according to Rep. John D. Dingell, chairman of the House Energy and Commerce Committee.

Mr. Dingell sent a letter dated June 4 to Richard Breeden, chairman man of the SEC, asking for a full report of "your investigation into the circumstances surrounding certain municipal bonds backed by guaranteed investment contracts." The SEC had no official response.

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