Investment icon buffett to be grilled

Regulators have called Warren Buffett to answer questions next month about any involvement he might have had in an insurance transaction between a unit of his company, Berkshire Hathaway and American International Group, the Wall Street Journal reported on Tuesday. The newspaper, citing people familiar with the matter, said Buffett's interview is set for April 11. The office of New York Attorney General Eliot Spitzer and the Securities and Exchange Commission, are handling the probe.