DETROIT (AP) - General Motors Corp. shares fell almost seven per cent late Thursday, the day after the company said it received a Securities and Exchange Commission subpoena for documents about its dealings with parts maker Delphi Corp. and other matters.

GM shares fell $1.98, or 6.8 per cent, to close at $27.19 Thursday on the New York Stock Exchange. The stock has traded between $24.67 and $40.82 over the past year.

In its filing, GM said it was co-operating with the SEC "in connection with investigations reported by the media concerning pension and other post-employment benefits . . . and certain transactions between General Motors and Delphi."

DaimlerChrysler AG revealed in an SEC filing this week that the SEC has subpoenaed information about the way the company calculates pension benefits for North American employees.

DaimlerChrysler said the request was connected to an investigation of accounting issues at GM that began in October 2004, and that Ford Motor Co. also has been subpoenaed.

GM said the SEC subpoenas covered "various matters involving GM that it has under investigation (including) GM's recovery of recall costs from suppliers and supplier price reductions or credits." The SEC is investigating "any obligation GM may have to fund pension and (post-employment benefit) costs in connection with Delphi's proceedings under Chapter 11" bankruptcy protection, GM said.

GM said it also has received SEC and federal grand jury subpoenas involving its General Motors Acceptance Corp. financing arm as part of "industry wide investigations into practices in the insurance industry relating to loss mitigation insurance."

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