Smith Barney today said it terminated four brokers as a result of an internal probe of trading practices, according to a Reuters report. The names of the brokers were not released. A Smith Barney spokeswoman said they four were terminated "for inappropriate behavior related to market timing." The internal probe was in response to New York Attorney General Eliot Spitzer and the SEC's industrywide investigation of violations related to the trading of mutual fund shares. Calls to Smith Barney were not returned.